Revision
1.有相当长的一段时间黑人受到不平等的待遇.他们没有选举权.
There was a long time when blacks were not treated equally. They had no right to vote.
2. 美国民众强烈要求废除奴隶制,消除种族歧视,给黑人民权.
The American public strongly demanded that slavery (should)be ended/abolished and that racial discrimination be removed/fought against and that black people be given their civil rights.
1.有相当长的一段时间黑人受到不平等的待遇.他们没有选举权.
There was a long time when blacks were not treated equally. They had no right to vote.
2. 美国民众强烈要求废除奴隶制,消除种族歧视,给黑人民权.
The American public strongly demanded that slavery (should)be ended/abolished and that racial discrimination be removed/fought against and that black people be given their civil rights.

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