Whose playing provided an alternative model to Louis Armstrong's hot style for many white jazz musicians?

What event or development caused a final decline of Roman authority in the Western empire, starting about the year 400?

a. an earthquake that destroyed most of Rome b. a violent civil war between rival emperors c. a new wave of barbarian invasions d. a Christian army that sacked the capital

Why did Islam become the dominant faith of West Africa?

a. West Africans felt that Islam offered greater freedoms than Christianity did. b. Muslims forced most West African women into marriage. c. Muslims gradually came to dominate trans-Saharan trade routes, and their faith followed. d. West Africans believed that Islam would give them access to Paradise.