This treaty, signed on February 2, 1848, ended the war between the United States and Mexico. By its terms, Mexico ceded 55 percent of its territory.1839 JANUARY 23 Texas Congress passes joint resolution approving of President Sam Houston's withdrawal of annexation proposal. President Andrés Manuel López Obrador submitted to the Chamber of Deputies a package of 18 constitutional amendments and two legal reform initiatives. We ought not, we cannot, give up on the 14th Amendment. 180. The 14 th Amendment, ratified in 1868, provides three important constitutional rights: citizenship, due process and equal protection. The 2012 Transboundary Agreement left a gap that needs to be filled:. Foreign (and other private) investment in the energy sector was restricted to the Mexican state until 201314. That "choice made all the sense in the world in light of the simultaneously negotiated. Downstream Contracts that promised Texas water districts.