The answer is D. During the war many German colonies were seized by the British and French. The German colonies in the Pacific were taken by Japan. A lot of fighting would also take place in African colonies.
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Tecumseh was a tribal leader who thought all Native Americans needed to get together to force US to stop its expansion. Together the Native Americans were strong enough that US would stop to avoid an armed conflict.
Because the soviets were with the nazis at that time and europe was going to be taken over during world war II
The US's the fear of Radicals and the Bolshevik revolution in Russia. US Police roundedup suspected foreign born radicals and had them expelled from the United States. Fed growing demands to limit immigration.