Can someone describe the Atlantic system to me?

Atlantic system was a slave trade, it transported goods from all over.

Explanation:

The network of trade established in the 1700s that bound together western Europe, Africa, and the Americas. Europeans sold slaves from west Africa and bought commodities that were produced by the new colonial plantations in the Americas and the Caribbean

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.

i think they came to washington to protest