The group that did not benefit was Farmers!
Answer:
<em>Lincoln means that, since he considered the constitution and the law of United States of America to be superior above any state, then, to his ability, he would defend the constitution upon which the country is binded (that is, unify the States together).</em>
<em>This is to ensure that America was never disintegrated into smaller countries.</em>
Explanation:
During the Civil War, the South was officially separated from the country (at least in their eyes). Therefore anyone who didn't pledge allegiance to the South, such as Unionists, were traitors and therefore had no rights.