The modern Republic of Egypt was founded in 1953, and with the complete withdrawal of British forces from the Suez Canal in 1956, it marked the first time in 2500 years that Egypt was both fully independent and ruled by native Egyptians. President Gamal Abdel Nasser (president from 1956 to 1970) introduced many reforms and created the short-lived United Arab Republic (with Syria). His terms also saw the Six-Day War and the creation of the international Non-Aligned Movement. His successor, Anwar Sadat (president from 1970 to 1981) changed Egypt's trajectory, departing from many of the political, and economic tenets of Nasserism, re-instituting a multi-party system and launching the Infitah economic policy. He led Egypt in the Yom Kippur War of 1973 to regain Egypt's Sinai Peninsula, which Israel had occupied since the Six-Day War of 1967. This later led to the Egypt-Israel Peace Treaty.