Final answer:
The greatest challenge for the Continental Congress during the Revolutionary War was procuring supplies and manpower due to a lack of centralized authority and funding.
Step-by-step explanation:
The biggest challenge for the Continental Congress during the Revolutionary War was getting the states to supply the army with uniforms, weapons, ammunition, food, and soldiers. This was a result of the deep-seated fear of a strong central government and each state's greatest loyalty to itself. Consequently, achieving the supplies and organizing the army were hindered by a lack of national unity. Furthermore, the Congress's lack of power to tax and the individual states' burdens led to a debilitating national debt and insufficient provisions for the Continental Army.