Final answer:
Congress struggled under the Articles of Confederation due to limited national governmental power, difficulties in passing legislation, and the inability to impose taxes or enforce policies, leading to the call for a stronger federal government.
Step-by-step explanation:
The difficulties Congress faced under the Articles of Confederation were primarily due to the limited powers of the national government. Important legislative decisions required the consensus of nine states, while any amendments needed unanimous consent, which was nearly impossible to achieve.
Moreover, the national government lacked the authority to impose taxes, rendering it financially crippled and incapable of paying debts or effectively managing foreign affairs and commerce. States had significant autonomy and could choose whether to adhere to national treaties and legislation, leading to a lack of cohesive policy and enforcement.
These issues highlighted the need for a stronger federal government and ultimately led to the Constitutional Convention and the creation of the United States Constitution.