Question

Why was it difficult for the provinces of Central America to be one government?

no experience in running a government
Spain had left too many soldiers
the upper class wanted their own country
too different from each other
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Answer 1

Simply put, the United States did not want either country governed by rulers it perceived to be friendly to the Soviets. It was feared that if the Central American governments became communist, the rest of Latin America would become communist, including Mexico, which borders the United States.