What are the lessons of history from the mexican american war that should be remembered?

After the U.S. Army occupied Mexico City, they fled to Querétaro with the country's provisional government. It was there that they decided to collect material that not only included their personal experiences but also other documents in order to examine the causes of the war. They wanted to understand why Mexico had lost the war and the nation's territory. They wanted to present this study in the form of "Apuntes" so that the information could serve as an example of how to preserve the nation in the future. That is the great achievement of this work. That the writers hoped it would teach other generations about the critical moments Mexico had experienced, about what had led to them, and how we could correct our course in order to preserve what remained of the territory and the nation.

they united the colonies in their fight against the british.