President Trump made major policy moves immediately after taking office, withdrawing from major international agreements, promising steep tariffs and pardoning nearly all of the Jan. 6 rioters.

Treaties ratified by the Senate in 1978 established permanent neutrality, but some Republicans regret that decision.

To return the canal to Panama, President Jimmy Carter worked to change minds and build a bipartisan coalition that put aside short-term political considerations.

A single week in 1979 underscored just how eventful Mr. Carter’s presidency really was.

Treaties ratified by the Senate in 1978 established permanent neutrality, but some Republicans regret that decision.