What is an early example of a presidential unilateral action?

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The Emancipation Proclamation was an early example of a presidential unilateral action in which President Abraham Lincoln issued the proclamation during the Civil War without seeking approval from Congress. The proclamation declared that all enslaved people in Confederate-held territory were to be freed, thus changing the nature of the war and solidifying Lincoln's legacy as a president who took bold, decisive action in the face of opposition. The other options listed do not represent unilateral actions taken by a president.

What Is an Early Example of a Presidential Unilateral Action