What were two factors that contributed to the fall of the western Roman Empire

Do humans change their physical environment to adapt or do humans adapt themselves to their physical environment?

In 1912, the imperial system that had ruled over china for thousands of years

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.