That depends on your definition of “united”, doesn’t it? The United States of Mexico or America are definitely “united” into one country, i.e. there aren’t really any serious secessionist movements, nearly all citizens speak the country’s main language etc. The USA are politically divided, but the divide doesn’t follow state borders that closely and many states are still swing states or flipped in the last 1-3 decades.
That depends on your definition of “united”, doesn’t it? The United States of Mexico or America are definitely “united” into one country, i.e. there aren’t really any serious secessionist movements, nearly all citizens speak the country’s main language etc. The USA are politically divided, but the divide doesn’t follow state borders that closely and many states are still swing states or flipped in the last 1-3 decades.