The u. s. constitution gives congress the power to print and coin money. that is, it can create one currency that will have value anywhere in the united states. before the constitution, each state printed its own currency. people had to convert the different currencies before they could trade between states. why would having one common currency be to americans in different states? wages are the same in every state for the same work because they are paid in the same currency. american business owners could trade more because the dollar is stronger than any state currency. trade between businesses in different states is easier because they are using the same currency. the government collects more in taxes because the dollar is stronger than any state currency.