Read the paragraph and answer the question that follows.

During the 1980s El Salvador faced a multiyear civil war battle fighting against guerillas who were trying to destroy the economy and instill fear in its residents. These guerillas fought to create a Marxist regime. Their approach resulted in thousands being killed and hundreds of thousands fleeing the country. Fearing a communist takeover, the United States supported El Salvador’s government and military. The United States pumped in billions of dollars to help maintain El Salvador’s democracy. Eventually, the hard work paid off, and El Salvador remained a free country with a free economy.

Which is the historical allusion?
communist
guerillas
Marxist