Answer & Explanation:
In his “house divided” speech, Lincoln countered that the Dred Scott decision the previous year had already opened the doors for slavery to be legal in the north, as well as all territories that the U.S. expanded into. If the U.S. wanted to be a free country, he argued, it had to act now before it was too late.
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Mexicans were angry about the close ties between U.S. business and the Mexican government. (APEX)
There are several important constitutional issues at the start of Reconstruction, but perhaps the greatest was if the newly freed slaves could be counted as citizens.
