Before World War I, the Prussian influence was greatly felt in Germany, and Prussia was still regarded as a powerful political and military force. The United States supported the unification of Germany, which strengthened Otto von Bismarck's power and came about after the Franco-Prussian war.

Prussia was created by a Grand Master of the Teutonic Order who was a member of the Hohenzollern family, the family that would go on to rule Prussia and Germany. He did this by declaring the crusade of the Teutonic order over and secularized the army and nation.

Prussia's rise to power was due to the savvy and intelligent rule of its ruler from the Great Elector through Frederick I (the Great). It was also due its maintenance of a large and effective standing army which the aforementioned rulers had been careful to create. Prussia lacked good soil, extensive mineral wealth, great size or manpower, and had little to no naval tradition. 

Garibaldi made headway in unifying the peninsula through military means, but allowed Cavour to complete the work he'd begun. Guglielmo Pepe was an Italian general who passed away before unification. Mussolini ruled Italy from 1922 to 1943, long after Italian unification. Dante was an Italian poet of the late Middle Ages.

The 1917 Russian Revolution was really two revolutions, with the later October Revolution building on developments of the February Revolution. The February Revolution grew out of street protests against the Tsarist government's war policies and food shortages; it resulted in the overthrow of the Tsar and the creation of a provisional republican government. The October Revolution was largely organized by the Soviet socialist groups who had gained power since the overthrow of the Tsar; these groups, led by Joseph Stalin, created a centralized, communist state that would become known as the Union of Soviet Socialist Republics (the USSR).

Oliver Cromwell was a fervent Puritan who served as a military commander and leader in the English Civil War that overthrew King Charles I of England. After the king was deposed and executed, England became a commonwealth that was led by the Rump Parliament, and in 1653, Cromwell was declared Lord Protector of the Commonwealth of England, Scotland, and Ireland, essentially becoming a dictator with unlimited power. Upon his death in 1658, he was briefly succeeded by his son, Robert, but Robert lacked the strength of his father and the monarchy was restored in 1660 to King Charles II.

The Bastille was a military fort in Paris that was converted into a prison, primarily for political prisoners. To many ordinary people, it represented the monarchy’s unlimited power and its ability to oppress those who disagreed with the monarch. The Bastille also contained gunpowder and other weapons that the people needed to fight the royal army. This need combined with the symbolism of the prison led it to be sacked by Parisians on July 14, 1789, when the citizens captured the prison, killed the governor and soldiers, and gained weapons. This conflict is regarded as the primary start of the French Revolution, as the citizens were able to defeat the monarch’s forces and show their power.

The House of Bourbon controlled the monarchy before the French Revolution, with the king and his family being executed in 1793 during the revolution. After various dysfunctional governments ruled, Napoleon took power as emperor in 1804. While in charge, he continually expanded France, much to the disdain of other European powers. In 1814, Napoleon was defeated by Britain, Russia, Austria, and Prussia, who placed King Louis XVIII on the throne of France due to indication of some support for the monarchy. Louis enacted many of the provisions that had been initiated during the revolution and agreed to a constitutional monarchy. Napoleon attempted a comeback in 1815, forcing Louis to give up the throne, but Napoleon was permanently defeated at Waterloo on June 18, 1815. Louis was then put back on the throne, but was held up by the allies who had defeated Napoleon until Louis XVIII died in 1824.

Pope John Paul II, born Karol Wojtyla, was a Polish cardinal who became pope in 1978. At the time, the USSR still had tremendous influence and power throughout Europe, particularly Poland. Poland was in turmoil as many workers were angry at the incompetent communist government and the poor economy. The pope went back to Poland in 1979, where he spoke about how each person had rights and helped to unite and inspire the people. The Catholic church then became an active participant in the fight against communism and worked to unify workers against communist regimes. It was through the church’s influence and involvement that many people turned against communism, with Pope John Paul II leading the fight.

The Glorious Revolution came about because of dissatisfaction in England with King James II, a Catholic monarch. The king was overthrown in favor of Mary, the Protestant daughter of James II, and her husband, William of Orange (a Dutch nobleman), who assumed a joint monarchy. The name "the Glorious Revolution" is somewhat misleading due to the fact that there was fighting, but it was minimal compared to the normal conflict that usually ensued during a transition of power in England. The fact that the movement was carried out by Parliament helped to legitimize the transition and quell violence. Overall, this revolution was far more organized and less violent than previous ones.