The first amendment of the United States Constitution allows the practice of religion. Freedom of religion is the right to be able to practice ones religion they chose fit.
The Fertile Crescent includes Mesopotamia, the land in and around the Tigris and Euphrates rivers; and the Levant, the eastern coast of the Mediterranean Sea. The modern-day countries with significant territory within the Fertile Crescent are Iraq, Syria, Lebanon, Cyprus, Jordan, Israel, Palestine, Egypt, as well as the southeastern fringe of Turkey and the western fringes of Iran
Because of imperialism, countries now had access to colonies. When the war started, they were able to equip their colonies to fight for their side. This led to higher tensions and increased involvement in the war.