Place the following events in the correct chronological order (earliest to latest).
Songhai overtook Mali
Mansa musa brought Muslim scholars, artist, and teachers to Mali
Mali became the center of trans-Saharan trade
Sundiata took over Ghana
1. Sundiata took over Ghana
2. Mali became the center of trans-Saharan trade
3. Mansa Musa brought Muslim scholars, artists, and teachers to Mali
4. Songhai overtook Mali