Answer: The Israeli occupation.
The West Bank is a landlocked territory near the Mediterranean coast of Western Asia. The entirety of the West Bank, including East Jerusalem, has been under Israeli occupation since 1967.
The international community considers Israeli settlements in the West Bank, including East Jerusalem, illegal under international law. Moreover, the International Court of Justice considers the West Bank and East Jerusalem occupied territory, with Isreal as the occupying power. This illegal occupation continues to be a source of conflict between Israelis and Palestinians.