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The nation was founded and "dedicated," to use Lincoln's language in the "Gettysburg Address," to equality as a "self-evident truth." But this very principle of equality, as Lincoln also noted, was a "proposition." To make it a reality remained "the unfinished work" of Americans.

The nation was founded and dedicated, to use Lincoln's language in the Gettysburg Address, to equality as a self-evident truth. But this very principle of equality, as Lincoln also noted, was a proposition. To make it a