In a display of his political genius, President Lincoln shrewdly justified the Emancipation Proclamation as a “fit and necessary war measure” in order to cripple the Confederacy's use of slaves in the war effort. ... With the issuance of the Emancipation Proclamation freedom for slaves now became a legitimate aim.
Explanation:
When a force acts on an object, the object may change shape by bending, stretching or compressing - or a combination of all three shape changes. ... Pull an object's ends apart, eg when a rubber band is stretched. Push an object's ends together, eg when an empty drinks can is squashed.
Marco polo was the first western explorer to reach china
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Mary Whiton Calkins was the first female to earn her doctoral degree in psychology, specifically in the United States. =)