<a href="https://en.wikipedia.org/wiki/Cold_War" id="mwAQI" rel="mw:WikiLink" title="Cold War">Cold War</a>: Eight Communist <a href="https://en.wikipedia.org/wiki/Eastern_Bloc" id="mwAQM" rel="mw:WikiLink" title="Eastern Bloc">bloc countries</a>, including the Soviet Union, sign a mutual defense treaty called the <a href="https://en.wikipedia.org/wiki/Warsaw_Pact" id="mwAQQ" rel="mw:WikiLink" title="Warsaw Pact">Warsaw Pact</a>.