Considered the turning point of the war because it was the last time the south invaded the north

The Battle of Gettysburg.

The Battle of Gettysburg was the south's last attempt in pushing the war into the northern states, as wars in the south displaced people, allowed the Northern armies to destroy much needed crops, economy, and what little means of production the South had. However, at the end, the South still lost, and it was a road to defeat soon after.

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explanation:

the answer is a) the proclamation of 1763.