When it came time to negotiate over the border between the United States and Mexico, the American negotiators chose to meet the Mexican negotiators in the Mexican Capital. With a large number of very well armed American Marines and Texas Rangers. That’s called a power move in the negotiating environment. Especially since the Mexican army was not allowed to sit in on negotiations due to having been largely thrashed by the American Marines and Texas Rangers while escorting the American negotiators to Mexico city. The negotiators quickly came to an agreement on the border between Texas and Mexico. The Rio Grande River.