1787 Philadelphia Convention
Nationalists—most of them war veterans—organized in every state and convinced Congress to call the Philadelphia Convention in 1787. The delegates from every state wrote a new Constitution that created a much more powerful and efficient central government, one with a strong president, and powers of taxation. The new government reflected the prevailing republican ideals of guarantees of individual liberty and of constraining the power of government through a system of separation of powers.
Conflicts over the issue of slavery in the first half of the 19th century culminated in the American Civil War, as eleven slave states seceded to found the Confederacy in 1861.
1896 Official segration
Plessy versus Ferguson decision by the Supreme Court states that racial segregation is approved under the "separate but equal" doctrine.
1956 The United States condemned Great Britain, France and Israel for their collective attack on Egypt. Israel, responding to terrorist attacks, seized the Sinai, while Britain and France colluded to seize the Suez Canal, which had earlier been seized by the Egyptians. All sides were forced to withdraw due to US pressure.
1964 , Gulf of Tonkin Resolution: U.S. begins major escalation of involvement in Viet Nam.
1965 Biological Agent sprayed on Barracks in Hawaii
As part of Project 112, the US military sprays a biological agent on barracks in Oahu, Hawaii. The agent is believed to be harmless but later shown to infect those with damaged immune systems.
1968 The Assassination of Dr. Martin Luther King Jr. Michael Luther King who was a leader of civil rights movement