What was the government of Zambia after independence?

Zambia ( / ˈzæmbiə / ), officially the Republic of Zambia, is a landlocked country in Southern Africa,[8] neighboring the Democratic Republic of the Congo to the north, Tanzania to the north-east, Malawi to the east, Mozambique, Zimbabwe, Botswana and Namibia to the south, and Angola to the west. The capital city is Lusaka, in the south-central part of Zambia. The population is concentrated mainly around Lusaka in the south and the Copper belt Province to the northwest, the core economic hubs of the country.