The correct answer among all the other choices is Steam locomotive. This is the transportation development that had the greatest long-term impact on the American economy. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.
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Germany was in a great depression
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American business interests needed to be protected
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The intervention of the United States in Nicaragua was mostly because of economic interests. The us wanted to have full control of the small Central American nation as it was located in a place that had the potential to be both of great benefit for the United States, but also to create a lot fo economic damage. One of those economic reasons was the planned canal in Nicaragua, that was going to compete with the one in Panama. Having the Panama canal under their control, the US didn't wanted another one that was going to compete with it and take away large portion of the money that they had secured with it.
<span>President Theodore Roosevelt’s policies toward Latin America were evidence of his beliefs in </span>intervention when American business interests were threatened.
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