Cholera proved to be one of the largest problems of the rapid urbanization and industrialization of the nineteenth century. Its spread was kept unchecked for two different but related reasons: its prevalence among the working poor and the incorrect beleif about its method of spreading. Most medical authorities of the time insisted it was caused by foul-smelling air in cities rather than the contaminated water supplies that actually spread cholera.

The Industrial Revolution began in Great Britain, but by 1807, a British entrepreneur named William Cockerill had created a textile-machine-manufacturing business in Belgium that helped spread the Industrial Revolution first around Belgium, then to France, and finally around the European continent. Cockerill was particularly important because at the time, Britain was engaged in a war with Napoleonic France and most of Europe was cut off from British industrial production and innovation.

The Sejm is the Polish Parliament. Historically members were elected by popular vote of landed nobility. Today it is elected by universal ballot.

The principal aims of Stalin's five-year plans were to develop a strong industrial economy centered on steel production, develop a powerful state army, increase agricultural production, and create a more socialist society. The development of artistic and literary talents was not one of the primary aims. In fact, Soviet art and literature became highly political during this era and was heavily influenced by propaganda.

The Thirty Years' War (1618-1648) was a continent-wide conflict that managed to ensnare every great European power of the time, initially with the Catholic Holy Roman Empire facing off against various Protestant states. A major turning point occurred in 1630, when Swedish armies led by King Gustavus Adolphus managed to turn the tide against the Imperial forces. After his death in the Battle of Lützen in 1632, the Protestant side faced serious setbacks against the Catholic armies of the Holy Roman Empire, and the end of the war with the Peace of Westphalia (1648) was largely based around settlements that were a setback from the heights of Sweden's power under Gustavus Adolphus.

Karl Marx explained this ideology in The Communist Manifesto. Communism, or Marxism, describes human history as a constant struggle between the rich and poor, and predicts the eventual uprising where the working class (the proletariat) rebels and seizes control.

Totalitarianism is a political system in which the government controls every facet of society and individuals liberties are nearly non-existent.

Fascism is the brand of totalitarianism that developed in European nations such as Germany, Italy, and Spain in the 1920's and '30's, which is also characterized by intense government propaganda to create loyalty to a charismatic leader.

Calvinism is not a political ideology, but a religion. It is a form of Protestantism that differs from other Christian sects in its belief in pre-determination, the idea that one's destination in the afterlife is already determined at birth.

Republicanism is an ideology in which the government is run by representatives elected by the citizens.

The Thirty Years' War (1618-1648) was a continent-wide conflict that managed to ensnare every great European power of the time, initially with the Catholic Holy Roman Empire facing off against various Protestant states. A major turning point occurred in 1630, when Swedish armies led by King Gustavus Adolphus managed to turn the tide against the Imperial forces. After his death in the Battle of Lützen in 1632, the Protestant side faced serious setbacks against the Catholic armies of the Holy Roman Empire, and the end of the war with the Peace of Westphalia (1648) was largely based around settlements that were a setback from the heights of Sweden's power under Gustavus Adolphus.

The Thirty Years' War (1618-1648) was a continent-wide conflict that managed to ensnare every great European power of the time, initially with the Catholic Holy Roman Empire facing off against various Protestant states. A major turning point occurred in 1630, when Swedish armies led by King Gustavus Adolphus managed to turn the tide against the Imperial forces. After his death in the Battle of Lützen in 1632, the Protestant side faced serious setbacks against the Catholic armies of the Holy Roman Empire, and the end of the war with the Peace of Westphalia (1648) was largely based around settlements that were a setback from the heights of Sweden's power under Gustavus Adolphus.

The Decembrist Uprising began when Tsar Alexander I died with an unclear succession plan, leading to confusion in the Russian leadership. A group of Russian Army officers, calling themselves "The Union of Salvation," took the chance to try and overthrow the Tsarist regime entirely, promoting serious electoral and governmental reforms. All of the leaders of the revolt, who were called Decembrists for the month in which the revolt took place, were executed by Tsar Nicholas I in early 1826.

The group that represented the Third Estate when the Kings of France called the Estates General was displeased with how power was being shared. Despite having twice the representatives, they did not have twice as many votes as the other estates. They therefore walked out and created their own rival organization that would take power and start the revolution, the National Assembly.