Which era does the second industrial revolution fall?

What is zinn's approach to the study of history? what does he suggest occurs when history is told is the story of human progress?

What did the u. s. want to build on the land acquired through the gadsden purchase?

Which statements describe einsatzgruppen? check all that apply. they were considered the last step in the "final solution." they were part of the german army. they carried out mass executions. they were known as mobilized killing units. they were used by germany during the invasions of poland and the soviet union.