They were the first American expedition to cross what is now the western portion of the United States.
<span>Ball vs Kennan There are many wars that has shaped the United States, but there is one specific war that greatly affected the United States. That war is the Vietnam War, also known as the Second Indochina War. The war was primarily between Communist North Vietnam and Anti-Communist South Vietnam. The United States involved in the war to help communism not spread to South Vietnam. </span>
