What principle weaknesses in the Article of Confederation led to the creation of the Constitution?

The limited powers granted to the national government by the Articles of Confederation made collecting tax money, passing and enforcing laws, and regulating trade either difficult or impossible, so major changes were necessary.

Explanation:

on the morning of  july 21,  1861, general mcdowell ordered the  unionarmy to attack. it was on this hill that  confederate  colonel thomas jackson and his forces held back theunion  troops.