Which country did not colonize a part of Africa?

I don't know if countries are listed for choices or options or does this question refer to countries of Africa aren't colonized. Of course, there are a lot of countries that haven't attempted to colonize a part of Africa due to their own circumstances during the course of history. There are only two countries that weren't colonized in the course of history, and these are Liberia and Ethiopia. Though they weren't completely colonized, they experienced their fair share of colonizing activities.