What is the circle that Marshall is referring to and why is it vicious? (Using quote: "The remedy lies in breaking the vicious circle and restoring the confidence of the European people in the economic future..."

The main reason the us senate rejected the treaty of versailles was because, isolationists felt the us should not have gotten into the war. republicans had gained power in the senate. democrats had gained power in the senate. european nations wanted to punish germany.