Which technique was one way andrew carnegie dominated the american steel industry in the late 1800s? ?

Vertical integration

Explanation:

Andrew Carnegie was able to dominate the Steel production because he eliminated competition with a process called horizontal integration. But later Carnegie created vertical integration that meant that he bought railroad companies and iron mines as a way to dominate the market by reducing the costs and produce cheaper steel.

the south did not want the federal laws to overrule the state laws.

the answer is d i aint explaining ; )