The main idea in Madison's federalist paper #51 is that checks and balances can and should be put in place in a federal government in order to keep any single branch from becoming too powerful.
Brown vs. The Board of Education was a case tried by the Supreme Court from 1952-1954, in which the Supreme Court ruled in favor of Brown, saying that for public schools to separate black and white students was unconstitutional.
The events of September 11, 2001 were heavily financed by Osama bin Laden as he was the head of the terroristic organization known as Al Quaeda, an importnat terroristic organization known at the time. He also took responsibility for the attacks later on.
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Night of the Long Knives, in German history, purge of Nazi leaders by Adolf Hitler on June 30, 1934. Fearing that the paramilitary SA had become too powerful, Hitler ordered his elite SS guards to murder the organization's leaders, including Ernst Röhm.
