The correct answer is revolution.
Revolution spurred American trade with northern Mexico.
Both Mexico and America they were sharing land border and maritime which was found in the North America.
Both countries had economic and diplomatic ties on the regime of Diaz as the president.
It is in this period of Diaz as the president where Mexico were able to open foreign investment where entrepreneurs from US invested in mining, agricultural enterprise and ranching.
In the revolution of Mexico U.S had a role which was important.