Well one is the reconstruction era and you also have the union and communism war
45: Mayflower Compact: first document to establish self-government in the American colonies.
Began in 1939, September 3 When Germany Invaded Poland
As the Cold War came to a close, the "United States" emerged as the only superpower, since previous the US and the USSR had been the main superpowers after WWII.
It was decided to a 7-1 majority ruled under the constitutionality of racial segregation laws under the “separate but equal” doctrine