Based on source 3, how did the War of 1812 begin? What was the result of that initial
battle?

In 1812, with President Madison in office, Congress declared war against the British. The war began with an attack on Canada, both as an effort to gain land and to cut off British supply lines to Tecumseh's Indian confederation, which had long troubled the US. The US troops were badly routed.

Explanation:

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answer; shays rebellion;