Why did the United States blame Great Britain when the Shawnee tribe attacked General Harrison and his troop?

The correct answer to this open question is the following.

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The United States blamed Great Britain when the Shawnee tribe attacked General Harrison and his troop because the federal US government thought that the English supported Tecumseh, who was the leader of the Shawnee, decide not to sign the Treaty of Fort Wayne of 1809.

This caused much conflict between the Shawnee and the white Americans. On November 7, 1811, in the so-called Battle of Tippecanoe, the troops sent by Governor William Henry Harrison(he was the governor of the Indian Territory) were attacked by surprise by the Native Indians. However, the troops -about 1000 soldiers- bravely resisted and defeated the Shawnee in the battleground of Prophetstown, next to the Tippecanoe River.

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

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