Four reasons that the US switched from isolationism to imperialism were as follows economic, social, political and lastly religious motives.
Explanation:
Economy was the main cause that lead to imperialism , Americans understood that new markets are required for the export purpose. Second cause was social and moral motives that is the Americans understood that western ideas should be circulated mainly they circulated ideas related to medicine, law as well as religion. Political was also important cause that lead to imperialism that competition took place so that new colonies can be formed.
Answer:
The two main threats to the spotted owl's continued survival are habitat loss and competition from the barred owl an invasive species native to eastern North America.
Explanation:
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The best answer is B. The river flooded yearly which allowed the fertile sediment on the bottom of the river to flow onto the farmland, keeping it fertile.