Because the article of confederation was not effective and couldn't unite the New America
Explanation:
The Articles of confederation was made when the United states of America got there independence from The British. it was adopted as the First constitution of the original 13 states that made up the United states then. the delegates decided to replace it after sighting its ineffectiveness and its inability to successfully unite the American people .
The ineffectiveness of the articles of confederation was proven in various events like the Northwest ordinance, the Shay's Rebellion and other events. the need for a stronger Federal Government led to the constitutional conference which led to the replacement of the articles of confederation. with a proper constitution
