The Gaza Strip was occupied by Egypt from 1948 to 1967 and then by Israel after 1967. In 2005, as part of Israel's unilateral disengagement plan, Israel removed all of its settlers and forces from the territory. Israel does not consider the Gaza Strip to be occupied territory and declared it a "foreign territory". That view has been disputed by numerous international humanitarian organizations and various bodies of the United Nations. Following June 2007, when Hamas assumed power in the Gaza Strip, Israel tightened its control of the Gaza crossings along its border, as well as by sea and air, and prevented persons from entering and exiting the area except for isolated cases it deemed humanitarian. Gaza has a border with Egypt and an agreement between Israel, the European Union and the PA governed how border crossing would take place (it was monitored by European observers). Egypt adhered to this agreement under Mubarak and prevented access to Gaza until April 2011 when it announced it was opening its border with Gaza.
When did Hamas assume it's power in the Gaza Strip?
June 2007