Robert E Lee and Gen Ulysses S. Grant met in the Wilmer McLean home at Appomattox Virginia at 1:00 PM to finalize the terms of surrender for the Confederate Army which effectively ended the US Civil War.
The 1920s were a unique time in the United States in the sense that it was a time of great economic prosperity and also great social woe. What led to this tension was a mix of rising immigration levels and and irresponsible attitude towards money and spending.
The strategy of "containment" is best known as a Cold War foreign policy of the United States and its allies to prevent the spread of communism after the end of World War II.