How old was harriet tubman when she escaped slavery?

Select four weaknesses of the articles of confederation. 1)they could not contribute any positive laws to the government. 2)they served as the government that brought on the revolutionary war. 3)congress had no power to collect taxes. 4)equal voting power in congress led to jealousies between states. 5)the executive branch held too much power. 6)congress had no power to control trade. 7)there was no system of national courts. 8)there was no voting power for small states