9 of the 13 states were needed to approve a measure so that the Congress could pass it.
Explanation:
Under The Articles of Confederation (the first written form of government of the United States) there was only one branch within the central government, this branch was the legislative one, and was composed by a Congress with limited power. The Congress represented all 13 states equally and had the power to deal with foreign affairs, and borrow money from the states or foreign governments and it required 9 out of 13 states to approve a measure so that it could become a law; Congress lacked of power to collect taxes or deal with commerce, and looked weak inside and outside the country, this weaknesses led to the Constitutional Convention in which the Constitution and the federal government were created.
