C. It allowed the British to conquer Fort Niagara, a strategic position for infiltrating the United States.
Explanation:
- The Americans were defeated at the Siege of Detroit and the Battle of Queenston Heights, preventing their conquest of Upper Canada, an area that covered the wide belt of the Great Lakes coast.
- This improved the morale of the British, as well as the fact that their enemies' attempts to conquer Lower Canada failed and conquered Montreal.
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