Since the 15th century after Columbus, millions of African blacks were sold to America as slaves or labor, low status
翻译：自从15世纪哥伦布发现美洲新大陆后,数以百万计的非洲黑人被贩卖到美洲充当奴隶或劳动力,地位底下
Since the 15th century after Columbus, millions of African blacks were sold to America as slaves or labor, low status