How did the geography of the Yucatán, home of the Maya civilization, help to promote trade? A. A harsh climate forced the people to barter for most of their food. B. Large inland lakes and streams let the people import food items. C. A lack of forests made it easier to build an extensive road system. D. Rivers and a long ocean shoreline made transporting goods easier.

the answer to your question is:

strong-mayor system

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation:

we need the chart or check box

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.