Why did the US get involved in events El Salvador and Nicaragua?

* Fear of communism: The US feared that El Salvador would become a communist state, allowing Cuba to have another base in Latin America.

* Economic interests: The US had significant economic interests in El Salvador, and the government was concerned about the economic instability that would result from a communist takeover.

* Security concerns: The US was concerned about the potential for instability in El Salvador to spill over into neighboring countries.

Nicaragua

* Sandinista revolution: The US was opposed to the Sandinista revolution in Nicaragua, which overthrew the US-backed dictator Anastasio Somoza Debayle.

* Soviet influence: The US was concerned about the growing Soviet influence in Nicaragua, and the potential for Nicaragua to become a Soviet ally.

* Geopolitical considerations: The US saw Nicaragua as a strategic location in Central America, and was concerned about the potential for Nicaragua to become a base for operations by Cuban and Soviet forces.

In both cases, the US used a variety of tactics to intervene in the countries, including providing military and economic aid to their respective governments, sending military advisers, and carrying out covert operations. The US also used diplomatic pressure and threats of economic sanctions to influence the governments of El Salvador and Nicaragua.