Weaknesses of the Articles of Confederation

In the aftermath of the American Revolution, the newly independent states faced numerous challenges in establishing a functional government. One significant development during this period was the enactment of the Articles of Confederation. This document aimed to unify the states under a central authority, yet it had several inherent weaknesses that foreshadowed future governmental struggles.

Which of the following weaknesses of the Articles of Confederation most directly contributed to the events leading to the Constitutional Convention of 1787?