Why did the Manhattan neighborhood of Harlem become a center for Afro-centric art, music, poetry, and politics?

As a result, Harlem, a neighborhood at the northern end of Manhattan, became a center for Afro-centric art, music, poetry, and politics; Revived by the wartime migration and fired up by the white violence of the postwar riots, urban blacks developed a strong cultural expression in the 1920s that came to be known

Explanation:

richard allen was a minister for a african methodist episcopal church. he was also a educator and a writer one of america most active and influential black leaders. in 1794, he founded a african methodist episcopal church in philadelphia, pennsylvania. the church that he founded was the first independent african american denomination in the united states. he was a influential leader that makes many people feel comfortable under his preachings. they trusted him and supported him even though it could get them in trouble because slavery was happening. he risked his life to bring slaves and others closer to god and writing books. as a boy he and his family were slaves but some how he managed to teach himself how to read, write and preach. he has written four books about his life, slavery and hymns/preaching.

the answer is states.