1990 Nicaraguan general election

Ortega had held power since the FSLN toppled the Somoza dictatorship in 1979. Chamorro was the editor of the country's largest newspaper, La Prensa, which she took over after the assassination of her husband Pedro Joaquín Chamorro Cardenal in 1978.^[3] A vocal critic of the dictatorship, his murder galvanized support for the Sandinistas against the dictatorship.^[3] Following the revolution that overthrew Somoza, Violeta Chamorro initially supported the FSLN government, accepting an invitation to join the Junta of National Reconstruction.^[3] However she soon became disenchanted and resigned, returning to the newspaper and becoming a critic of the FSLN government.^[3] In 1989 the United States Congress approved $9 million for the promotion of democracy in Nicaragua, of which $2.5 million was set aside for the UNO, in addition to a $5 million grant for the opposition earlier that year.^[4] Beginning in early 1989 the government held a series of talks with the opposition about reforming electoral and media laws. In April 1989 the Electoral Law was reformed, giving the opposition a larger share of public campaign funds, increased access to state run media and permission to receive foreign financing.^[4]

With a diverse coalition of 14 opposition groups,^[2] the UNO mainly campaigned on a promise to end the decades of civil war and instability that wracked the country.

While the FSLN was mainly under controversy for their campaign due to their use of violence.

Opinion polls leading up to the elections divided along partisan lines, with 10 of 17 polls analyzed in a contemporary study predicting an UNO victory while 7 predicted the Sandinistas would retain power.^[5][6]

The election was organized by Mariano Fiallos Oyanguren, a law professor and Sandinista who was appointed by the FSLN in 1984 to head the Supreme Electoral Council. He faced party pressure to throw the race, specifically to announce at 19:00 on election night that the results of the first four precincts were four victories for the FSLN.^[7] Instead he chose to read the real results, which split the precincts, with two going to the FSLN and two to the ONU, which went on to win the election.^[7] Chamorro was elected with just under 55% of the vote.

Antonio Lacayo, a Sandinista supporter who voted for Ortega but ultimately served as a central figure in the Violeta Chamorro administration, said later: “Without Mariano Fiallos [Oyanguren] there would have been no democratic transition in 1990.”^[8]

Party		Votes	%	Seats
	National Opposition Union	764,748	53.88	51
	Sandinista National Liberation Front	579,723	40.84	39
	Social Christian Party	22,218	1.57	1
	Revolutionary Unity Movement	13,995	0.99	1
	Workers' Revolutionary Party	10,586	0.75	0
	Marxist–Leninist Popular Action Movement	7,643	0.54	0
	Social Conservative Party	6,308	0.44	0
	Central American Unionist Party	5,565	0.39	0
	Democratic Conservative Party	5,083	0.36	0
	Independent Liberal Party for National Unity	3,515	0.25	0
Total		1,419,384	100.00	92
Valid votes		1,419,384	93.87
Invalid/blank votes		92,723	6.13
Total votes		1,512,107	100.00
Registered voters/turnout		1,752,088	86.30
Source: Nohlen

Possible explanations for the ONU victory include that the Nicaraguan people were disenchanted with the Ortega government, specifically discontentment with the management of the economy and the hostile posture toward the United States, believing the ONU was more likely to bring peace.^[6] Additionally, in November 1989, the White House had met with Chamorro on the subject of peace and democracy in Nicaragua and announced that the economic embargo against Nicaragua would end if Chamorro won.^[10] There are also reports of intimidation from the side of the Contras,^[11] with a Canadian observer mission claiming that 42 people were killed by the Contras in "election violence" in October 1989.^[12]