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.
The romans helped the persian empire.
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Historians use things such as primary soursces like fossials, Artifacts and documentary evidence. Evidence that a historian uses to study is the written record. Historians use data collected by governments to study what the world was like in regards to numbers and records.
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it lasted 2 years and 8 months
John Quincy Adams in what is called the "Corrupt Bargain" of 1824
