Select the six weaknesses of the articles of confederation. Members were unable to be elected to congress. Different states had different numbers of votes in congress. Articles could only be changed by a unanimous vote. No federal court system existed. They were intended to be a temporary form of government. Congress was unable to declare war. Congress was unable to regulate trade or commerce. Nine states had to approve new laws in congress. There was no national head of state. No negotiations happened with other nations or indigenous peoples. Congress was unable to levy taxes.