How did Theodore Roosevelt enact "control of corporations" while he was president?

  The Square Deal was Theodore Roosevelt's domestic program, which reflected his three major goals: conservation of natural resources, control of corporations, and consumer protection. These three demands are often referred to as the "three Cs" of Roosevelt's Square Deal.

Explanation:  One of Roosevelt's acts as president was to deliver a 20,000-word address to Congress asking it to curb the power of large corporations (called "trusts"). He also spoke in support of organized labor to further chagrin big business, but to their delight, he endorsed the gold standard, protective tariffs and lower taxes.

the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.