Richard Nixon was elected president in 1968 and re-elected in 1972. His foreign policy successes included establishing diplomatic relations with China, negotiating arms limitations with the Soviet Union, and ending U.S. involvement in Vietnam. However, the Watergate scandal erupted in 1972-1973 involving the break-in at the Democratic National Committee headquarters and subsequent cover-up, ultimately leading to Nixon's resignation in 1974 to avoid impeachment. His domestic policies were overshadowed by economic troubles including inflation and the 1973 oil crisis. Gerald Ford succeeded Nixon as president and granted him a full pardon for any Watergate crimes.