What was the origin of the u. s. containment policy during the second half of the 1900s?

Which phrase describes one of the reforms the national convention made up to improve the lives of ordinary french people

The impeachment of president clinton by the u.s. house of representatives occurred with a. virtually all republicans supporting it, while virtually all democrats opposed it b. about two-thirds of republicans supporting it and about two-thirds of democrats opposing it c. half of all democrats and half of all republicans supporting it, while half of all democrats and half of all republicans opposed it d. virtually all democrats supporting it, while virtually all republicans opposed it

When conducting research for forming a hypothesis, which practice should historians follow?