What caused the explosion of inventions in the late 19th century? ?

Which man believed that african americans should actively fight for the rights they deserve, even if they put their lives in danger?

When lincoln was first elected president, he hoped to prevent war by allowing (1) in the united states.

According to us supporters, which was a benefit of purchasing alaska? the territory would be a buffer to invasions from europe. the territory would provide a place for many americans to live. it would increase trade by improving access to the northern pacific. it would increase the united states’ power by creating a bond with russia.