Why would industrialists, such as Rockefeller, have resisted
competition by trying to control an entire
industry?

"Large corporations exist only because they are created and protected by our institutions." Theodore Roosevelt.

Explanation:

In this way, the former president described the country's situation related to certain corporations, including the one owned by Rockefeller. In that way, the president started a showdown with monopolistic companies in the country. The idea was to create more competition in the market. That way, everyone would have an equal chance of succeeding, and the market would become fairer. The president has succeeded in his efforts bypassing several laws. Large corporations were powerless to oppose state policy.

a.) are both appointed for life