The U.S. likely has a long-term vision of Israel returning to its pre-1967 borders at some point in the future. It was the U.S. that insisted on Israel returning the Sinai Peninsula to Egypt under the 1976 peace accords, after all.
The peace treaty between Egypt and Israel was signed 16 months after Egyptian president Anwar Sadat's visit to Israel in 1977 after intense negotiation. The main features of the treaty were mutual recognition, cessation of the state of war that had existed since the 1948 Arab–Israeli War, normalization of relations and the complete withdrawal by Israel of its armed forces and civilians from the Sinai Peninsula which Israel had captured during the Six-Day War in 1967. Egypt agreed to leave the area demilitarized. The agreement also provided for the free passage of Israeli ships through the Suez Canal, and recognition of the Strait of Tiran and the Gulf of Aqaba as international waterways.
The agreement notably made Egypt the first Arab state to officially recognize Israel.
The UN MFO is still in Sinai monitoring the peace agreement.