The best reason as to why the caliphs demonstrated religious tolerance to Jews and Christians would be because "D. the caliphs knew freedom of worship led to an overall stronger empire," since allowing people to worship freely meant that they were less likely to rebel against the state.
The outbreak of World War II spurred the mobilization of America military industrial might
American settlers and American Indians often clashed as settlement spread across the West during that era
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Explanation:
I would say the answer is Visigoths.