单项选择题

Black people were first taken to North America as slaves in the seventeenth century. Sold by Arab or Mrican slave-traders in West Mrica, they were on the tobacco, sugar and cotton plantations.
Towards the end of the eighteenth century, more and more people began to condemn (谴责) slavery, but it was not until after the bitter Civil war-between the Northern and Southern states of America that is was abolished there. In 1865 the 13th Amendment to the Constitution gave blacks the right to live and work where they liked. Then ,in 1867, came further legislation (立法)guaranteeing citizenship and other civil rights.
However, there were setbacks almost immediately. The Supreme Court declared the civil rights legislation of 1867 unconstitutional and a number of new segregation (种族隔离)laws were enacted. Consequently ,as more and more blacks deserted the rural areas in search of work in the cities, they found themselves forced to .live in areas with the worst housing and poorest services.
after World War Ⅱ, the climate was more favorable to improvement. Organizations pressed more vigorously for full equality. By 1950, blacks were entitled to education in the same schools and colleges as white. The Civil Rights Commission was formed. There massive demonstrations by both blacks and whites to try to force a solution to the problem. The Civil Rights Bill, Providing for equal opportunity, was passed in 1964.
Nowadays, large numbers of the best-known entertainers and sportsmen or sportswomen in America are black. And black people are playing important role in American society.

When did black people first come to America（）

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