<em>Answer and Explanation:</em>
<em>The Cahokia was Important because, It was made possibly by two basic innovations. The most important was "</em><em>Agriculture</em><em>" </em>
<em>Preserving, the remains of an ancient Native American city near Collinsville, Illinois, the Cahokia Mounds State Historic Site is across the Mississippi River from St. Louis, Missouri.</em>
I think false because the Aztecs and Incas did not know the same language.
D. It declared all slaves in states fighting for the Union free.
Any slave that was in US territory, as well as any slave that was located in the South that wanted to fight for the Union was declared free.
~