Cold War

The Cold War was a sustained, lengthy state of political and military unrest between national powers after World War II.

Background
It was termed as "cold" because there was no large-scale fighting directly between the two sides, although there were major regional wars, known as proxy wars. The Vietnam War was one of these proxy wars that saw both anti- and pro-communist forces battling for supremacy over their ideological precipices.

Due to Fallout's divergence from the real world timeline, it is unknown how accurate the Cold War was in the series' timeline.