Premise: Mexico ( México , [ ˈme.xi.ko ] , modern Nahuatl ) , officially the United Mexican States ( [ Estados Unidos Mexicanos , links = no ] , ) , is a federal republic in the southern portion of North America . Mexico City , or the City of Mexico ( Ciudad de México , [ sjuˈða ðe ˈmexiko ] ; abbreviated as `` CDMX '' ) , is the capital and most populous city of Mexico .
Hypothesis: Mexico City is not in a federal republic.
Label: CONTRADICTION