Traditionally it has been the US Civil War and WW2.
Benedict Arnold.
The war was going on when aristotle was famous
Ohio is famous in the history by the Native Americans and the War
1861, the un-declared US Civil War, officially called the "War of the Rebellion", and also known as the "War between the states."
While certainly an important event in US history, the US Civil War didn't "lead" or "start" the study of US History.
The Us Civil War was the bloodiest war recorded in US history.
The statement that US history is not taught past the Vietnam War is not correct. US colleges and secondary schools have quite different US history boundaries. There is a mass of US history running past the War in Vietnam.
The most famous traitor is definitely Benedict Arnold. He was a colonist who fought in the Revolutionary War. He eventually became a spy for the British when he got tired of losing battles.
basically the war followed him
The World War II. -PlutoLover101
Within the US the Revolutionary War and the Civil War alone should be counted.