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 political ideals.

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