When did hiram revels of mississippi becomes the first black us senator?

What two different approaches did the knights of labor and the american federation of labor take in building a union organization? a) the knights of labor accepted only unskilled workers; the american federation of labor accepted only skilled workers. b) the knights of labor accepted skilled and unskilled workers; the american federation of labor accepted only skilled workers.c) the knights of labor refused to accept african american or chinese workers; the american federation of labor accepted all workers.d) the knights of labor accepted workers from a single industry; the american federation of labor accepted workers from several industries.

According to some historians which marks at the beginning of the us civil war

In 1869, jay gould and james fisk’s actions caused a scandal in new york city. blank, the secretary of the treasury, informed the president about this scandal.