Why did President Lincoln choose not to make the Civil War a struggle over slavery?

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President Lincoln believed that he did not have the constitutional power to abolish slavery in the states where it already existed without violating their rights as sovereign states. He also believed that the main goal of the war was to preserve the Union, and making it a struggle over slavery would not be politically feasible or necessary for achieving that goal. However, as the war progressed, Lincoln began to embrace emancipation as a strategic measure to weaken the Confederacy and end the war.

Why Did President Lincoln Choose Not to Make the Civil