<span>Westward expansion led to loss of life and territory for Native Americans and added to the growing conflict between "free" and "slave" states before the Civil War.</span>
It would be "(A) Institution of a secret ballot" that was not part of the Populist Party’s platform, since the Populists were largely about transparency--both within government and big business.
The Pentagon Papers revealed that the Harry S. Truman administration gave military support to France against the Communist led Viet Minh, which directly involved the United States in the Vietnam War.
