The US long ago made peace with Mexico and they are not asking for return of either California or Texas. Texas and California both were not taken by the US anyway. Both were independent Republics who later joined the US. But if you are anxious to become a citizen of Mexico, it's only about 100 miles south on Interstate 5 or US 101. Feel free to move. The US has no exit restrictions.
Army: Blast in Korean DMZ wounds two South Korean soldiers (Reuters)
from the article: U.S. planning to restart Israel-PA talks based on '67 borders