A series of peace treaties left the areas now known as the West Bank and Gaza under the control of Jordan and Egypt respectively. However, in 1967, the Israel launched a pre-emptive war against Syria, Jordan and Egypt (referred to in Israel as the Six-Day War). In this war, Israel took the areas of the Sinai Peninsula and Gaza from Egypt (they later returned the Sinai to Egypt as part of the Camp David Accord), the West Bank and Jerusalem from Jordan and the Golan Heights from Syria. Many Palestinians in these areas were again pushed out, creating a second wave of Palestinian refugees. The UN agency that deals with Palestinian Refugees, UNRWA (United Nations Relief and Works Agency), defines refugees as "people whose normal place of residence was Palestine between June 1946 and May 1948, who lost both their homes and means of livelihood as a result of the 1948 Arab-Israeli conflict." But even in their own work with the 58 official refugee camps in Gaza, the West Bank, Jordan, Lebanon and Syria, they acknowledge that ten of the camps had to be constructed after the 1967 conflict. When it started in 1950 UNRWA estimated that it served around 750,000 Palestinian refugees. Today there are almost 5 million official Palestinian refugees qualifying for their services, with about one-third (1.4 million) still living in the camps that were set up back in 1948 and 1967.
Below is a map showing the areas, with Area C in brown. In all, 61% of the West Bank is Area C (completely controlled by Israel) and only 18% is Area A (under complete control of the Palestinian Authority).