The common factor shared by the Korean and Vietnam wars, the Suez Crisis and the Arab-Israeli Conflict are that the Soviet Union and the U.S. were involved.
The U.S. and the Soviet Union supported opposing sides in several conflicts in the 1900s such as the Arab-Israeli Conflict where the U.S. supported Israel and the Soviets supported the Egyptians.
The Soviets also supported the North Koreans in the Korean War while the U.S. supported the South Koreans.
Find out more on the Korean War at https://brainly.com/question/3542970.