Answer:
When the cold war happened the domino theory came true;indochina became communist which proved the domino theory.Proxy wars are interventions in which a foreign state supports another place indirectly with a lot less support than direct intervention.There were many proxy wars that happened during the cold war for example when the USA supports a cold war based proxy war were the russian were attacking democratic based afghanistan and the afghanistans were getting support of democrats. The russians killed the president and put a russian loyal person in the afghanistan government.