Answer:
Large areas of Europe were conquered by Muslims. When these areas such as southern Spain were recaptured and placed under Christian rule Muslim customs and architecture remained. Christians were encouraged to go on Crusade to recapture Jerusalem from the Muslims.
Industrialization would later influence imperialism and encourage free trade.
Answer:
Abu Bakr was an adviser and companion of the Prophet Muhammad. Abu Abu Bakr controlled the administration and later selected as caliph (ruler of the Islam community) after Muhammad's death. As a caliph, Abu Bakr launched many military campaigns to bring Arabia under Islam and was successful in expanding Islam further through conquering.
