Which statement is true about military service in the united states?
a. all citizens must complete military service or an alternative.
b. military service is strictly voluntary.
c. all males between 18 and 25 must register for a potential draft.
d. all citizens must register for a potential military draft.

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.