Yes they did because they wanted African Americans to return to the land of their ancestors
I got three for ya
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1.) The gold rush caused California's population to increase dramatically;
2.) it brought people from many different backgrounds to California; it made California more democratic because people were more equal in mining communities;
3.) it caused Native Americans and Californios to lose their land
Farmers faced tough times. While most Americans enjoyed relative prosperity for most of the 1920s, the Great Depression for the American farmer really began after World War I. Much of the Roaring '20s was a continual cycle of debt for the American farmer, stemming from falling farm prices and the need to purchase expensive machinery. When the stock market crashed in 1929 sending prices in an even more downward cycle, many American farmers wondered if their hardscrabble lives would ever improve.
The spread of Islam into the Maghreb is an example of Arab invasion of North Africa. The Arabs send Muslim army to Maghreb (modern morocco) to battle against Byzantines and allies, and finally conquer most of the North Africa were many Berbers (locals of Maghreb) join the Muslim army. After Arabs gain more power in the region, the Berbers are now ready to adopt and convert to Islam as well as the Arabic culture.