How did andrew carnegie gain control of the steel industry? a. by giving away his money b. by becoming a partner of edwin drake c. by buying all the other steel mills d. by practicing vertical consolidation

c. by buying all the other steel mills Explanation:

The Bessemer Process

This is a process known as horizontal integration.

Andrew Carnegie also created a vertical combination, an idea first implemented by Gustavus Swift. He bought railroad companies and iron mines. If he owned the rails and the mines, he could reduce his costs and produce cheaper steel.

the population grew a lot and was making more money

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.