During the 1980s , both the FSLN ( a leftist collection of political parties ) and the Contras ( a rightist collection of counter-revolutionary groups ) received Receiving large amounts of aid Assistance from the Cold War Hostile_encounter superpowers ( respectively , the Soviet Union and the United States ) .

The Contra War Hostile_encounter ended Process_end after the signing Sign_agreement of the Tela Accord in 1989 and the demobilization Emptying of the FSLN and Contra armies .

A second election Choosing in 1990 resulted in Causation the election Choosing of a majority of anti-Sandinista parties and the FSLN handing Giving over power .