Why does this part of texas maintain close economic and cultural ties to mexico?

answer; /// representative democracy restricting trade,is your correct answer;

hello,

answer: a federal government has final authority on interstate/inter provincial  and international affairs, a confederation is one where the central/national government or authority is governing body what does not have final say over the same matters. hopefully this and i will try again if you don't like this answer : )

best of luck!

rain should be the answer.