Trip from US to MEXICO

Hey guys I am just getting into cb radios and I was wondering since I’m going on a road trip to Mexico and I was wondering if my CB radio from the US would work all the way to my destination down the south of Mexico when I get in trouble in Mexico if I use my CB radio do I have to change channels when I get to Mexico I mean we using it because we’re taking two vehicles and it would be easier to communicate via CB radios any help would be very greatly appreciated thank you for your time