United States of Central America (informal name), more properly known as the United Provinces of Central America and the Federal Republic of Central America (through several name changes), a defunct 19th century federation of the nations of Central America
United States of Africa, a political concept/proposal, similar to the United States of Europe
United States of China, a political concept of a federalized China modeled after the United States that was once advocated before the unification of China by Chiang Kai-shek. See also Federal Republic of China
The United States of the West created by the admission of the European countries as states into the United States of America as satirically advocated by Régis Debray in his paper Empire 2.0
Uniform title: Act to continue an act, intituled, "An act declaring the assent of Congress to certain acts of the states of Maryland, Georgia, and Rhode-Island and Providence Plantations
by United States
[Philadelphia : Printed by Childs and Swaine, 1791]