Answer:
The corollary stated that not only were the nations of the Western Hemisphere not open to colonization by European powers, but that the United States had the responsibility to preserve order and protect life and property in those countries.
Land was needed to gain power so the need for bigger, stronger ships was needed so that they could be sailed through the rough oceans without being sank to reach land
Near Boston, the military engagements were the battles of Lexington & Concord which initiated the American Revolution.
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