Federalist No. 13 is an essay by Alexander Hamilton, the thirteenth of the Federalist Papers. It was published on November 28, 1787 under the pseudonym Publius, the name under which all the Federalist Papers were published. It is titled, "Advantage of the Union in Respect to Economy in Government."
This essay focuses on the view that a Union would be more economically sound than separate States. Publius explains that rather than having many separate governments to support, a Union would have only one national government to support. He describes this as being both simpler and more economical. The essay further explains that in order to defend themselves, separate States would have to work together, but their support of one another would be disjointed. Only a fully united government would provide the best defense for all the States and be able to support military establishments and necessary civil servants.