The correct answer would be the last one, as the planned invasion of Japan would be extremely bloody and difficult, and Truman wanted to use the atomic bomb to try and get the Japanese to surrender instead of forcing them to surrender via invasion.
The fact of isolationism and they had already purchased Hawaii and Alaska, the manifest destiny was about moving west, when you are too far west you can’t go west or else your drown in Pacific Ocean
Answer: The Tet Offensive.
The Tet Offensive (officially <em>The General Offensive and Uprising of Tet Mau Than 1968</em>) was one of the largest military campaigns of the Vietnam War, launched on January 30, 1968 by forces of the Viet Cong and North Vietnamese People's Army of the Republic of Vietnam against the forces of the South Vietnamese Army of the Republic of Vietnam, the United States Armed Forces, and their allies.
The offensive shocked the U. S. public and had a strong effect on the U. S. government. Americans had thought that the North Vietnamese were being defeated and were incapable of launching such an ambitious attack. Public support for the war significantly decreased, the media became more critical and the U.S. sought negotiations to end the war.
