Which statements were a factor in the decline of Sumer? Select all correct answers.
Nomads invaded Sumerian city-states.
O A drought caused poor crop production.
Salinization of the soil occurred.
The cultivated soil had poor drainage.

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.