Final answer:
The Arab states lost territory to Israel during the Six-Day War in 1967, where Israel captured the Sinai Peninsula, Gaza Strip, Golan Heights, and the West Bank after preemptive strikes and military engagement with neighboring Arab countries.
Step-by-step explanation:
The Arab states lost a significant amount of territory to Israel in 1967 during what is known as the Six-Day War. The conflict began when Israel launched a preemptive strike against Egypt and rapidly progressed as Israel took control of critical territories from neighboring Arab countries. By the end of the Six-Day War, Israel had captured the Sinai Peninsula and the Gaza Strip from Egypt, the Golan Heights from Syria, and the West Bank from Jordan, significantly expanding its borders.
These actions were a response to mounting tensions and hostile activities, including the build-up of Arab forces and the closure of the Straits of Tiran. The outcomes of the war have had lasting impacts on the geopolitical landscape of the Middle East and continue to influence Israeli-Arab relations.