is it true that there are places with mexican food in america??

i am a person that was born and well still lives in mexico and learned english at a very young age,and well i am a very huge fan of america and american culture!!! i'm glad a lot of american stores and places and even food are here,thanks for that. but anyway, one time when i was browsing through the internet i found some videos of people that were saying that there were like mexican villages in the united states and there was also a lot of mexican food there?? why is that??? i thought mexican food was only found here, like, beans, and tacos, i heard about taco bell but i believe that's just a new thing. thanks!!!