Final answer:
The Mexican-American War holds constitutional significance for both the United States and Mexico, each in its own context. The Treaty of Guadalupe Hidalgo involved constitutional promises to Hispanic Americans, while Mexico's constitutional development owes much to efforts made during struggles for national identity and independence.
Step-by-step explanation:
The Mexican-American War was a conflict that occurred between the United States and Mexico from 1846 to 1848. It has constitutional relevance in the context of both countries. In the treaty ending the war, the Treaty of Guadalupe Hidalgo, the United States promised U.S. citizenship to the Hispanics living in the newly gained territories. Despite this, they were essentially treated as second-class citizens, and most quickly lost their lands to White settlers.
In Mexico's history, the constitutional aspects relate more to the country's efforts to create a legal system reflecting the needs and desires of its people. Morelos y Pavón, for example, composed Sentiments of the Nation in 1813 with the purpose of guiding a congress charged with writing a constitution for the new nation of Mexico. Furthermore, the Mexican Constitution itself, first adopted in 1917 and amended over 200 times since, is a testament to the country's ongoing efforts to uphold and extend social justice and constitutional rights.
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