The National Party (Afrikaans: Nasionale Party, NP), also known as the Nationalist Party, was a political party in South Africa from 1914 to 1997, which was responsible for the implementation of apartheid rule. The party was an Afrikaner ethnic nationalist party, which initially promoted the interests of Afrikaners but later became a stalwart promoter and enactor of white supremacy, for which it is best known. It first became the governing party of the country in 1924. It merged with its rival, the South African Party (SAP), during the 1929-1939 Great Depression, and a splinter faction, the Re-United National Party became the official opposition during World War II and won power in 1948. With the National Party governing South Africa from 4 June 1948 until 9 May 1994, the country for the bulk of this time was only a de jure or partial democracy, as from 1958 onwards non-white people were barred from voting. In 1990, it began to style itself as simply a South African civic nationalist party, and after the fall of apartheid in 1994, attempted to become a moderate conservative one. The party's reputation was damaged irreparably by perpetrating apartheid, and it rebranded itself as the New National Party in 1997 before eventually dissolving in 2005.
Following the 1948 general election, the party as the governing party of South Africa began implementing its policy of racial segregation, known as apartheid (the Afrikaans term for "separateness"). Although White-minority rule and racial segregation were already in existence in South Africa with non-Whites not having voting rights and efforts made to encourage segregation, apartheid intensified the segregation with stern penalties for non-Whites entering into areas designated for Whites-only without having a pass to permit them to do so (known as the pass laws), interracial marriage and sexual relationships were illegal and punishable offences. Black people faced significant restrictions on property rights. After South Africa was condemned by the British Commonwealth for its policies of apartheid, the NP-led government had South Africa leave the Commonwealth, abandon its monarchy led by the British monarch and become an independent republic. The party's system of apartheid was officially labelled a crime against humanity by the United Nations General Assembly on 16 December 1966.