The Treaty of Guadalupe Hidalgo, signed on February 2, is a significant historical document that ended the Mexican-American War and resulted in a substantial expansion of U.S. territory. This treaty led to Mexico ceding large portions of its northern territories, which now include parts of California, Arizona, New Mexico, and other states, in exchange for $15 million from the U.S. and the settlement of certain claims. The day is commemorated to symbolize the peaceful resolution of conflict through diplomacy and is observed with various celebrations, including hosting fiestas with traditional Mexican cuisine, exploring historical sites, and watching documentaries about the treaty. Additionally, communities may organize picnics, workshops, and art activities to honor the cultural impact of the treaty on American and Mexican societies.