Answer: Science and math education
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Road and canals were built to help them
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<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>
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it makes the world spin that how much its important
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