The release of two atomic bombs on Japan in August 1945 helped end World War II but ushered in the Cold War, a conflict between the United States and the Soviet Union that dragged on nearly half a century. ... Cold War calculations led to a divided Germany and U.S. involvement in wars in Korea and Vietnam
In 1950 as American forces largely left Korea, the North invaded the South. Proxy conflicts and espionage erupted around the globe during the Cold War. The early posturing and saber-rattling proved to be a template for future action by the Soviet Union, the United States, and their allies.
When they act against their common interests and/or threaten the safety of the people without cause. Basically, if they cause unecessary harm to the people of that country or state etc.
Tet was an important role in weakening U.S. public support for the war in Vietnam. Americans felt progressively uncertain about the efficacy of like cold war tactics.
