Reagan was able to avoid the blame by promising to assit anti- Communist insurgencies, bu the so called "Reagan Doctrine" political hurdle following the mid-term elections. Also, there were no Oval Office tapes. When it came to hostages Reagan gave them an ultimatum, bring he men home. So, they made a arms-for-hostage deal in which the United States would sell weapons to Iran.
Islam spread through military conquest, trade, pilgrimage, and missionaries. Arab Muslim forces conquered vast territories and built imperial structures over time.