Why did Lincoln need the support of the border states

Freeing the slaves in the border states might have cost Lincoln the support of the border states. As important as freeing the slaves was to Lincoln the support of the border states was more important to the war effort

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the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation.