The headquarters of the African Union is in:

**The reasoning** The African Union (AU) has its headquarters in **Addis Ababa, Ethiopia**. This was established when the AU was formed in 2002, replacing the Organization of African Unity (OAU), which also had its headquarters there since 1963. Ethiopia was chosen partly because it's one of Africa's oldest independent nations and was never colonized (except for a brief Italian occupation). The AU headquarters building itself was actually funded and built by China as a gift to Africa, inaugurated in 2012. **Why the wrong options tempt you** - **Abuja** is Nigeria's capital — your home bias might make you think "big African country = AU headquarters" - **Accra** (Ghana) is a major West African hub and hosts many regional organizations, so it sounds plausible - **Cairo** (Egypt) is in North Africa and extremely prominent historically, making it seem like a natural choice for continental headquarters **Quick takeaway** Remember: **AU = Addis Ababa** (both start with 'A'!). Ethiopia's proud history of independence made it the symbolic home for Africa's unity.