The United States is the nation where most of the action of the Watchmen graphic novel takes place. Located geographically in North America, between the countries of Canada (to the north) and Mexico (to the south), it is one of the most largest and most populous nations in the world. The geography of the United States also includes the Pacific Ocean island chain of Hawaii and Alaska, which borders on the northwest coast of Canada.
Because Watchmen takes place in an alternate history of United States society, much of its 20th Century history has been altered by the author. The United States has won the Vietnam War, due largely to the intervention of Dr. Manhattan. Additionally, Richard Nixon has been elected to more than two terms as President. Most vehicles, cars, trucks, etc, are powered by lithium batteries, a process that was unfeasible in the past before Dr. Manhattan was able to synthesize lithium on a large scale.