Why did France, Britain, and Israel invade egypt??

The catalyst for the joint Israeli-British-French attack on Egypt was the nationalization of the Suez Canal by Egyptian leader General Gamal Abdel Nasser in July 1956. The situation had been brewing for some time. ... The Soviet Union began to issue ominous threats about coming to Egypt's aid.On October 29, 1956, 10 Israeli brigades invaded Egypt and advanced toward the canal, routing Egyptian forces. Britain and France, following their plan, demanded that Israeli and Egyptian troops withdraw from the canal, and they announced that they would intervene to enforce a cease-fire ordered by the United Nations.

"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.

could you give me the options ?