In the late 1800's, what was the process where the U. S. Underwent a rapid change from a primarily agricultural economy to one led by manufacturing?

What would lead a historian to consider two events to have a relationship of correlation rather than causation?

23. how does specialization among nations encourage interdependence? nations work together to share labor and resources to produce vital goods. nations sign treaties prohibiting taxes on imports. nations produce specific goods and then trade to obtain things they need. nations that are more developed agree to fund development in nations with limited industry.

Which concept is plato expressing in the excerpt below? when men have both done and suffered tyranny, and have had experience of both . . they think that they had better agree among themselves to have neither. . —plato, the republic: book ii