[The Dark]

America in 2300 is a significant power, but not a superpower. 2300AD notes that France was "the only global power" by the time of the Saudi War (2010-2013), and was the global superpower from 2060 to 2150. America remained divided until 2045, and was unwilling to fight Mexico in 2103 when California, Arizona, New Mexico, and Baja started the Mexican Civil War, despite wanting to reclaim their original borders. America's noted as being late to return to space ("American-Australian Cooperation"), and it's noted that its domination of the North American continent is "diminished" by the rising power of Canada and Mexico. None of that sounds like America being a superpower in 2300, but rather a strong second-tier player, such as the UK or France in the 1980s - someone you don't particularly want to go out of your way to piss off, but also not an 800-pound gorilla in international relations. Even if one looks at extrasolar colonies, they have 8. France has 16, Germany has 7, Manchuria has 14, Australia and Britain both have 5, Canada and Australia each have 4, even Texas has 3.