What is the most likely reason that Italy and Germany supported the Nationalists in the Spanish Civil War?

The Nationalists, led by Francisco Franco, were a right-wing force that sought to overthrow Spain’s republican government and establish an authoritarian regime. Fascist Italy and Nazi Germany supported Franco because they wanted to strengthen fascism in Europe and weaken the spread of communism. Thus, the best answer is “Italy and Germany wanted to promote the spread of fascism.”

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