What was the main reason southern colonists altered the land?

Slaves and indentured servants, although present in the North, were much more important to the South. They were the backbone of the Southern economy. Settlers in the Southern colonies came to America to seek economic prosperity they could not find in Old England.

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the answer is

congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make 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.