A player attends baseball training to be a better player instead of taking a vacation. What was the opportunity cost?

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.

What would be considered a secondary source about the assasination of abraham lincoln

What is domino theory? how did domino theory impact the us involvement in the vietnam war