Docs Teach offers a lesson on teaching with this document: the exchange copy of the treaty, written in both Spanish and English. This copy, given to the United States by Mexico, provides proof that the treaty was ratified by the Mexican government.
Spend some time with this document - Docs Teach suggest using a 'jigsaw' grouping to investigate it. Come back together as a class and use the QFT to discover the many questions that this Treaty brought up for the emerging states in the west. Using the Circle of Viewpoints could prove engaging as different perspectives emerge as investigation into the results of this war.