What were the biggest changes in the movie industry in the 1920s?

1. The use of advertising posters.

2. The move to New York as the center of the movie making industry in the USA.

3. The introduction of color.

4. The introduction of sound.

How did industrial production improvements impact export-dependent areas of the world during the great depression?   a.  demand for certain raw materials rose.      b.  demand for certain raw materials fell.      c.  the new technology was exported to most raw material producing nations.      d.  there was a decrease in tariffs.

What event caused south carolina to secede from union in 1860

The supreme court ruled that slaves could not sue because they could not read. they could not become lawyers. they lived in southern states. they were not considered citizens.