The United States of America
Let's see, no American Revolution, no War of 1812 (thus no war for Americans to PRETEND they won), no Fenians, no Spanish-American War, no Yanks coming late to the party in World War I when we didn't need them, no Yanks crashing the stock market, no Yanks stealing all the credit in World War II, no nukes, no Cold War, Korean War would have been finished instead of continuing on into modern times, no Vietnam War, Gulf War would have been completed, no America taking over a bunch of random-ass South American and Caribbean countries (like Haiti, natch) for no reason, no America fucking up in Somalia, no Yanks crashing the stock market AGAIN...
tl;dr No America, better world, because that area would be either Canadian, or a completely different country (or countries).
