Advances in Technology/Exchange After 1900
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AP World History: Modern › Advances in Technology/Exchange After 1900
In the twentieth century, many states invested in public transportation systems like subways and buses, while others prioritized highways. These choices shaped urban form, commuting patterns, and pollution levels. Which statement best explains why some cities after 1900 developed extensive subway systems?
The absence of electricity made underground trains cheaper than surface travel and eliminated the need for power generation infrastructure
High population density and congestion encouraged investment in rapid mass transit, allowing cities to move large numbers efficiently without expanding road space
The end of engineering education prevented complex construction, so cities built subways because they were simpler than roads
A universal ban on public spending forced cities to build subways using only private donations and volunteer labor
The decline of urbanization reduced travel demand, making subways an unnecessary luxury adopted mainly by small rural towns
Explanation
High urban density necessitated efficient transport like subways to handle crowds without more roads. This reduced congestion and supported growth. Investments reflected planning priorities. Unlike absent electricity or declining urbanization, density drove mass transit. Cities like Tokyo exemplify this. Subways shaped modern urban mobility.
From the 1970s onward, many economies shifted toward flexible manufacturing, just-in-time inventory, and global sourcing. Computers helped coordinate production schedules and track shipments, while trade liberalization reduced tariffs in many regions. Which development best explains how firms were able to disperse manufacturing across multiple countries after 1900?
The abolition of shipping insurance, which made international trade too risky and forced firms to produce only for local markets
Advances in information technology and logistics, which enabled real-time coordination of suppliers and factories across long distances
The decline of telecommunications, which forced firms to decentralize because they could not coordinate production from a single headquarters
The collapse of ports and canals, which reduced maritime transport and therefore encouraged transoceanic factory networks
The end of standardized parts, which made global manufacturing networks easier by requiring each factory to invent unique components
Explanation
Firms dispersed manufacturing globally thanks to IT and logistics that enabled efficient coordination. Real-time tracking and communication reduced risks in supply chains. This supported just-in-time models and trade liberalization. Unlike declining telecom or ending standards, these advances facilitated dispersion. For example, companies like Apple source components worldwide. This trend deepened economic globalization.
After 1900, international tourism expanded, aided by air travel, cruise ships, and global advertising. Many states promoted heritage sites and beach resorts to earn foreign currency. This sometimes created tensions over environmental protection and local cultural change. Which outcome best reflects the impact of mass tourism on local economies after 1900?
A universal shift away from urbanization, as tourism required all workers to live in rural villages far from transportation hubs
Increased dependence on service-sector jobs and foreign visitors’ spending, which could boost incomes but also create vulnerability to global downturns
The end of global inequality, because tourism automatically redistributed wealth evenly from rich travelers to all host communities
The total elimination of cultural exchange, because tourists rarely interacted with local residents or consumed local goods and services
The disappearance of environmental concerns, since tourist revenue always funded conservation and prevented ecosystem damage
Explanation
Mass tourism created jobs in services like hospitality, boosting local incomes from foreign spending. However, it made economies vulnerable to fluctuations in travel. It often led to environmental and cultural strains. Unlike eliminating exchange or inequality, it fostered dependencies. States promoted it for revenue. This reflects tourism's double-edged economic impact.
After 1900, new energy systems—oil, natural gas, and expanded electricity grids—powered factories, homes, and transportation. Control over energy resources became a major strategic concern for states, influencing alliances and conflicts. Which development most directly linked global politics to energy resources in the twentieth century?
The end of maritime shipping, which eliminated tanker routes and made petroleum trade irrelevant to international relations
The replacement of electricity with candlelight, which reduced infrastructure needs and limited state interest in energy production
The decline of industrial energy use, which made resource-rich regions less important and reduced competition for fuel supplies
The strategic importance of Middle Eastern petroleum, which influenced foreign policy, alliances, and interventions as industrial economies depended on oil supplies
The global abandonment of motor vehicles, which ended demand for gasoline and removed oil from international political calculations
Explanation
Oil's role in industrial economies made Middle Eastern supplies strategically vital. This influenced alliances, policies, and conflicts for access. Unlike declining energy use, it heightened competition. For example, embargoes affected global politics. Control over resources became a power lever. Energy thus intertwined with international relations.
After 1900, the spread of refrigeration, pasteurization, and cold-chain transport transformed diets. Meat, dairy, and fresh produce could be shipped farther and stored longer, changing urban consumption and global agribusiness. Which effect most directly followed from these food-storage and transport technologies?
A rapid decline in caloric intake, as preserved foods became less accessible and more expensive for most consumers
The disappearance of urban populations, because refrigerated transport made cities unable to feed themselves efficiently
Greater year-round availability of perishable foods in cities, as cold storage reduced spoilage and expanded long-distance trade in fresh products
The end of international food trade, as refrigeration made it unnecessary to move goods across borders or between rural and urban regions
A universal shift to subsistence farming, as cold storage eliminated markets and reduced incentives for commercial agriculture
Explanation
Refrigeration and cold chains extended the shelf life of foods, enabling long-distance trade. This provided urban areas with year-round access to perishables like fruits and meat. It transformed diets and supported agribusiness growth. Unlike ending trade or subsistence shifts, it enhanced availability. Global food markets expanded as a result. These technologies improved nutrition but raised sustainability questions.
During the mid-to-late twentieth century, container shipping, jet aircraft, and computerized logistics reduced transportation costs and sped up global trade. Manufacturers increasingly located different stages of production in multiple countries, linking suppliers, assembly plants, and retailers through fast, predictable shipping. Which development most directly reflects this technological transformation after 1900?
The decline of international trade as countries abandoned exports, since faster shipping made domestic self-sufficiency cheaper than global specialization.
The elimination of port cities, because containerization removed the need for coastal infrastructure and shifted all commerce to inland caravans.
The spread of global supply chains and outsourcing, as firms coordinated production across borders using standardized containers and rapid air freight.
The replacement of industrial labor with agriculture, since logistics innovations made factory work obsolete and revived peasant farming worldwide.
A return to mercantilist monopolies, as faster transport allowed single empires to block competitors and control all raw materials permanently.
Explanation
Container shipping, jet aircraft, and computerized logistics revolutionized global trade by dramatically reducing transportation costs and increasing speed and reliability. The standardization of shipping containers in the 1960s allowed goods to move seamlessly between ships, trucks, and trains, while computerized tracking systems enabled precise coordination of complex supply chains. These innovations made it economically feasible for companies to locate different stages of production in multiple countries, taking advantage of comparative advantages in labor costs, resources, or expertise. A single product might have components manufactured in dozens of countries before final assembly and distribution. This technological transformation enabled the rise of multinational corporations that could coordinate production globally, leading to increased outsourcing and the development of intricate international supply chains. The result was an unprecedented integration of global markets and production systems that defined late twentieth-century globalization.
In the decades after 1900, medical advances such as vaccines, antibiotics, and improved sanitation spread through imperial connections, international organizations, and public health campaigns. These technologies reduced deaths from infectious diseases in many regions, even where poverty remained widespread. Which demographic change was most directly associated with these developments?
A universal shift to aging societies by 1930, as antibiotics quickly produced low fertility and high elderly proportions across all continents.
The end of migration, because improved public health made border controls unnecessary and removed incentives for labor movement across regions.
A long‑term rise in population growth rates, as mortality fell faster than fertility in many societies during early stages of demographic transition.
A sharp global decline in life expectancy, because new medicines weakened immune systems and increased mortality from previously minor infections.
An immediate worldwide drop in birthrates to replacement level, since vaccines directly reduced fertility and discouraged family formation everywhere.
Explanation
Medical advances after 1900, including vaccines, antibiotics, and improved sanitation, dramatically reduced mortality rates from infectious diseases that had previously killed millions. This mortality decline occurred faster than fertility rates adjusted downward, creating a demographic transition characterized by rapid population growth. In many developing regions, death rates plummeted while birth rates remained high for several decades, leading to population explosions. For example, the introduction of DDT to control malaria-carrying mosquitoes and mass vaccination campaigns against smallpox saved countless lives but contributed to accelerating population growth in Africa, Asia, and Latin America during the mid-twentieth century. This demographic pattern - falling mortality preceding falling fertility - became a defining feature of modernization in many societies. The resulting population growth had profound implications for economic development, urbanization, and resource management throughout the twentieth century.
After 1900, new energy technologies expanded electrification through power grids, while later decades saw growing investment in renewable energy such as wind and solar. These changes were shaped by industrial demand, state planning, and concerns over pollution and climate impacts from fossil fuels. Which factor most directly encouraged many governments to promote renewable energy in the late twentieth and early twenty-first centuries?
A global shortage of sunlight and wind, which forced states to ration renewable resources and replace them with expanded coal-burning power plants.
A universal ban on scientific research, which prevented fossil-fuel extraction and left renewable energy as the only accidental alternative.
The desire to restore preindustrial craft economies, since renewables required abandoning factories and returning workers to household production systems.
The collapse of electricity grids worldwide, which made electrification impossible and pushed societies to eliminate modern energy consumption entirely.
Concerns about air pollution and greenhouse-gas emissions, leading to policies supporting alternatives to fossil fuels and diversifying energy supplies.
Explanation
The promotion of renewable energy technologies in the late twentieth and early twenty-first centuries was primarily driven by growing environmental concerns about fossil fuel use. Scientific evidence accumulated showing that burning coal, oil, and natural gas released greenhouse gases contributing to climate change, while also creating air pollution that harmed human health and ecosystems. International agreements like the Kyoto Protocol and Paris Climate Accord reflected global recognition of these problems. Governments began implementing policies to support wind, solar, and other renewable energy sources through subsidies, tax incentives, and renewable energy mandates. The desire to reduce dependence on imported fossil fuels and enhance energy security also motivated renewable energy development. Technological improvements made renewables increasingly cost-competitive with traditional energy sources. This shift represented a fundamental reconsideration of energy policy driven by environmental imperatives and the need to transition toward more sustainable energy systems.
In the mid-twentieth century, nuclear physics led to atomic weapons and civilian nuclear power programs. During the Cold War, the United States and the Soviet Union built large arsenals and developed delivery systems such as long-range bombers and missiles, reshaping diplomacy and military planning. Which concept best describes the strategic effect of these technologies?
Mercantilist rivalry, in which empires restricted colonial trade to monopolies and used tariffs as the primary weapon against competitors.
Mutually assured destruction, in which the likelihood of catastrophic retaliation discouraged direct superpower war despite intense rivalry and proxy conflicts.
Gunboat diplomacy, in which small naval squadrons forced concessions from great powers by threatening limited coastal bombardments and blockades.
Collective security through the League of Nations, which prevented arms races by enforcing universal disarmament and guaranteeing borders after 1919.
Cultural assimilation, in which nuclear technology mainly spread languages and religions, reducing political tensions through shared traditions and values.
Explanation
The development of nuclear weapons in the mid-twentieth century created the strategic doctrine of mutually assured destruction (MAD), which paradoxically helped prevent direct warfare between nuclear-armed superpowers. Both the United States and Soviet Union built arsenals capable of destroying each other many times over, delivered by intercontinental ballistic missiles, submarine-launched missiles, and strategic bombers. The certainty that any nuclear attack would trigger devastating retaliation made the actual use of these weapons virtually unthinkable for rational actors. This nuclear standoff shaped Cold War diplomacy, as both superpowers engaged in proxy conflicts, arms control negotiations, and careful crisis management to avoid direct confrontation. The Cuban Missile Crisis of 1962 demonstrated both the dangers of nuclear brinkmanship and the restraining effect of MAD. While nuclear weapons created unprecedented existential risks for humanity, they also imposed a form of stability on great power relations that discouraged the kind of direct warfare seen in earlier eras.
In the early twentieth century, mass production of automobiles and expanded oil extraction reshaped daily life. New roads, gasoline stations, and trucking networks connected cities to suburbs and rural markets, while assembly-line methods lowered consumer prices. At the same time, dependence on petroleum increased, and governments invested heavily in highways and fuel supplies. Which development most directly resulted from these technological changes after 1900?
A rapid end to fossil-fuel use, as governments shifted directly from coal to solar power for transportation in the 1920s and 1930s.
The immediate collapse of maritime shipping, since trucks fully replaced ocean freight and ended international commodity chains by mid-century.
The growth of suburbs and commuting, as cheap cars and highway construction enabled residential separation from workplaces in many industrialized societies.
A return to craft production, as assembly lines were rejected by consumers who preferred handmade goods and local markets over mass products.
A global decline in urbanization as workers returned to subsistence farming, reducing the need for mechanized transport and long-distance trade networks.
Explanation
The mass production of automobiles and expansion of oil extraction after 1900 fundamentally transformed urban and suburban landscapes. As cars became affordable through assembly-line production, people could live farther from their workplaces, leading to the growth of suburbs connected by new highways and roads. This suburbanization pattern was particularly pronounced in industrialized nations like the United States, where government investment in highway infrastructure and cheap gasoline enabled residential communities to develop at increasing distances from city centers. The automobile revolution created a new spatial organization of society, with commuting becoming a daily reality for millions. This transformation was supported by the parallel development of gasoline stations, trucking networks, and petroleum infrastructure that made personal vehicle ownership practical and economical.