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"Athens and Sparta, both powerful Greek city-states, had fought as allies in the Greco-Persian Wars between 499 and 449 B.C" http://www.history.com/topics/peloponnesian-war.
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"On October 25, 1415, during the Hundred Years' War (1337-1453) between England and France, Henry V (1386-1422), the young king of England, led his forces to victory at the Battle of Agincourt in northern France. After further conquests in France, Henry V was recognized in 1420 as heir to the French throne and the regent of France." http://www.history.com/topics/battle-of-agincourt
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"The revolutionaries ranged from liberal reformers to socialist radicals to fiery nationalists. One of these nationalist movements was the Risorgimento, or “Resurgence” movement on the Italian peninsula, which sought to unify the entire peninsula into one great Italian state." http://filebox.vt.edu/users/bgilkers/digitaltimeline/italydepth.html
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"The war began in October, 1853 between Russia and the Ottoman Empire, and by March," http://www.cwreenactors.com/~crimean/criwar.htm
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"the northern and southern United States over issues including states' rights versus federal authority, westward expansion and slavery exploded into the American Civil War" http://www.history.com/topics/american-civil-war
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"Hitler's invasion of Poland in September 1939 drove Great Britain and France to declare war on Germany, and World War II had begun" http://www.history.com/topics/world-war-ii
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"Afghanistan War, 1978–92, conflict between anti-Communist Muslim Afghan guerrillas (mujahidin) and Afghan government and Soviet forces." http://www.infoplease.com/encyclopedia/history/afghanistan-war.html
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" On April 25, 1898 the United States declared war on Spain following the sinking of the Battleship Maine in Havana harbor on February 15, 1898. The war ended with the signing of the Treaty of Paris on December 10, 1898." http://www.loc.gov/rr/hispanic/1898/intro.html
