What increased the carrying capacity of Irish land during the 1500s, leading to a rapid increase in population

What was the focus of the stanford study-pls

In the course of illness senerational campaign against stephen douglas in1858 abraham declared that

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.