What was the idea that the u. s. was destined to extend its territory across the entire continent called?

How did slavery end in the united statesa. it ended with the emancipation proclamationb. it ended when the union won the civil warc. it ended with the fifteenth amendmentd. it ended with the 13th amendment

What effect did ww11 have on empires that had been created by european nations

What industry was exempt from the child-labor laws passed in the factory act of 1833?