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Answer:
The Progressive Era is considered from 1890 to 1920. The major role of the United States in global affairs during this period of time was its involvement in the war.
The military affairs of that time included the war with Spain, the war to conquer the Philippines and the entry into the First World W
The Northeast did not agree with the Mexican War.
The United States believed that the Trail of Tears was a necessary evil. They knew that they needed the vast land with all its resources and possibilities so they believed that the Native Americans had to be relocated from the area in order for the United States to prosper. They didn't care much what happened to them as long as they got the land.<span />