One of Galileo’s contributions to science was creating the coordinate plane system.
developing the scientific method.
improving the telescope.
inventing the astrolabe.

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.

How did the us become involved in ww1

1. "what to the slave is the fourth of july? " by frederick douglass ? 2. a slave who gains his freedom by olaudah equiano