Answer:
President Eisenhower believed in the domino theory as it applied to world politics, which held that if a country entered the Communist sphere, it would drag others from its area towards that same ideology.
Step-by-step explanation:
This theory arose during the Cold War before the observation of several events that seemed to corroborate it. Before and during the Second World War there was a contagion of ideologies in Europe. On their own initiative, such as Hungary or Romania, which adopted pro-fascist or pro-Nazi governments, or by force, such as Vichy France, Norway, Spain or the Netherlands. Another example was the communist ideology that extended Russia (shortly after renamed the Soviet Union) to annex countries that had been part of the Russian Empire as Ukraine, Belarus or the Baltic Republics during World War II.