Mexico City (or D.F.) is the capital city of Mexico. Classified as the Federal District (Distrito Federal), it is commonly abbreviated as Mexico D.F. or just D.F. It is a federal entity meaning it doesn't belong to any of the 31 Mexican states but belongs to the federation as a whole. Mexico City is Mexico's largest city and is its cultural, political and economical center. It is the largest Spanish speaking city on Earth as the Greater Mexico City area holds about 20 million people. #2A
Tamaulipas, officially Free and Sovereign State of Tamaulipas, is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is divided in 43 municipalities and its capital city is Ciudad Victoria.