before the expedition got under way in 1804, what important development changed the shape and size of the United States and made Lewis and Clark's journey even more important?

Lewis was 28 years old, Clark 32. Before the expedition got under way in 1804, what important development changed the shape and size of the United States and made Lewis and Clark's journey even more important? the Louisiana Purchase.

the Louisiana Purchase.

Explanation:

sorry if im wrong

it was a act of seld fesnse more over it was a peace treaty between the fogein contunries.

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.