Final answer:
Several African countries underwent changes in the twentieth century as they gained independence from colonial powers.
Step-by-step explanation:
In the twentieth century, several African countries underwent significant changes as they gained their independence from colonial powers. Some of these countries include Angola, Botswana, Congo, Lesotho, Madagascar, Malawi, Mauritius, Mozambique, Namibia, Seychelles, South Africa, Swaziland, Tanzania, Zambia, and Zimbabwe.