Which concern led the US Senate to reject the Treaty of Versailles?

The United States rejected the Treaty of Versailles due to the opposition of a group of senators called the Irreconcilables, who believed that under the terms of the treaty, the United States would lose too much of its autonomy to the League of Nations.

Explanation:

to force terrorists groups to stop attacking western targets using massive military force.

roosevelt essentially took the opposite approach as hoover in taking on the great depression. herbert hoover thought that america and its economy could naturally recover from the depression in due course, so he adamantly restrained the federal government from intervening on behalf of the people affected. on the other hand, roosevelt dramatically increased employment by expanding the federal government and establishing agencies that would aid in relieving some of the country's worst problems.