Hey i have to come up with a peice of western music and i was trying to thing of some mexican/western chords and so far ive pritty much faild so could you guys suggest some it would be much apreshiated

I believe what you're thinking of is the result of taking a normal key, like the key of C (C, Dm, Em, F, G, Am) and changing one of the chords in the key, I'm pretty sure it's the major version of the 3rd chord in a key that makes it sound "western" and "spanish", in the key of C, it's changing the E minor to E major