Kaunda's political party--the United National Independence Party (UNIP)--was founded in 1959 and was in power under Kaunda's leadership from 1964 to 1991. Before 1972, Zambia had three significant political parties--UNIP, the African National Congress (ANC), and the United Progressive Party (UPP). The ANC drew its strength from western and southern provinces, while the UPP found some support among Bemba-speakers in the Copperbelt and northern provinces. Although not strongly supported in all areas of the country, only UNIP had a nationwide following.

In December 1972, Zambian law established a one-party state, and all other political parties were banned; this was later enshrined in the 1973 constitution. Kaunda, the sole candidate, was elected President in the 1973 elections. Elections also were held for the National Assembly. Only UNIP members were permitted to run, but these seats were sharply contested. President Kaunda's mandate was renewed in December 1978, October 1983, and October 1988 in a "yes" or "no" vote on his candidacy.

Growing opposition to UNIP's monopoly on power led to the rise in 1990 of the Movement for Multiparty Democracy (MMD). The MMD assembled an increasingly impressive group of important Zambians, including prominent UNIP defectors and labor leaders. During the year, President Kaunda agreed to a referendum on the one-party state but, in the face of continued opposition, dropped the referendum and signed a constitutional amendment making Zambia a multi-party state. Zambia's first multi-party elections for parliament and the presidency since the 1960s were held on October 31, 1991. MMD candidate Frederick Chiluba resoundingly carried the presidential election over Kenneth Kaunda with 81% of the vote. To add to the MMD landslide, in the parliamentary elections the MMD won 125 of the 150 elected seats and UNIP the remaining 25. However, UNIP swept the Eastern Province, gathering 19 of its seats there.

By the end of Chiluba's first term as President (1996), the MMD's commitment to political reform had faded in the face of re-election demands. A number of prominent supporters founded opposing parties. Relying on the MMD's overwhelming majority in parliament, President Chiluba in May 1996 pushed through constitutional amendments that eliminated former President Kaunda and other prominent opposition leaders from the 1996 presidential elections. In the presidential and parliamentary elections held in November 1996, Chiluba was re-elected, and the MMD won 131 of the 150 seats in the National Assembly. Kaunda's UNIP party boycotted the parliamentary polls to protest the exclusion of its leader from the presidential race, alleging in addition that the outcome of the election had been predetermined due to a faulty voter registration exercise. Despite the UNIP boycott, the elections took place peacefully, and five presidential and more than 600 parliamentary candidates from 11 parties participated. Afterward, however, several opposition parties and non-governmental organizations declared the elections neither free nor fair. As President Chiluba began his second term in 1997, the opposition continued to reject the results of the election amid international efforts to encourage the MMD and the opposition to resolve their differences through dialogue.

Early in 2001, supporters of President Chiluba mounted a campaign to amend the constitution to enable Chiluba to seek a third term of office. Civil society, opposition parties, and many members of the ruling party exerted sufficient pressure on Chiluba to force him to back away from any attempt at a third term.

Presidential, parliamentary, and local government elections were held on December 27, 2001. Eleven parties contested the elections. The elections encountered numerous administrative problems. Opposition parties alleged that serious irregularities occurred. Nevertheless, MMD presidential candidate Levy Mwanawasa, having garnered a plurality of the vote (29%), was declared the victor by a narrow margin, and he was sworn into office on January 2, 2002. Three parties submitted petitions to the Supreme Court, challenging the election results, but the court ruled against the petitioners in February 2005. Opposition parties won a majority of parliamentary seats in the December 2001 election, but subsequent by-elections gave the ruling MMD a majority in parliament.

During his first months in office, President Mwanawasa encouraged the Zambian Anticorruption Commission to aggressively pursue its mandate. In July 2002, in a speech before the Zambian National Assembly, President Mwanawasa provided details on a number of corruption allegations targeting former President Chiluba, and called for Parliament to consider lifting Chiluba's immunity from prosecution. Mwanawasa appointed a special Task Force to investigate and prosecute corrupt officials. Zambian courts are now hearing cases involving corruption charges against Chiluba and numerous officials from his regime.

During his term in office, President Mwanawasa appointed an Electoral Reform Technical Committee (ERTC) and a Constitutional Reform Committee (CRC) to make recommendations for reforms. The ERTC submitted its final report to the President in August 2005. The Government of Zambia has not yet introduced legislation to propose changes to electoral procedures, and it is expected that the electoral process will not be changed significantly before national elections are held in the second half of 2006. Voter registration began on October 31 and continued through December 31, 2005. The CRC presented its final report and a draft constitution in December 2005. In February 2006 the government agreed to allow the formation of a Constituent Assembly to consider and adopt the draft constitution, subject to certain conditions.