Anti-Mexican sentiment is a negative attitude to people of Mexican descent, Mexican culture and/or accents of Mexican Spanish most commonly found in the United States.
In general it is closely associated with Mexican and United States Independence wars, and the struggle over Southwestern territories that once belonged to Spain through the establishment of building Catholic Missions. This eventually would lead to war between the two nations and the defeat of Mexico which came with a great loss of territory. In the 20th century, anti-Mexican sentiment continued to grow after the Zimmermann Telegram incident between the Mexican government during the Mexican Revolution and the German Empire during World War I, and again the secret talks with the Nazi party of Germany in the 1930s and early 1940s to invade the Southwest. Most of all, anti-Mexican sentiment in the USA stemmed from illegal immigration.
Throughout U.S. history, some Americans have circulated negative stereotypes regarding Mexican-Americans. Such stereotypes have long circulated in film and other media.
As the result of the Texas Revolution and Texas annexation, the United States inherited border disputes of the Republic of Texas with Mexico, which was the factor to the eruption of the Mexican–American War (1846–48). After the United States' victory over Mexico, Mexicans signed the Treaty of Guadalupe Hidalgo. This treaty entailed that Mexico cede over half its land to the United States in exchange for 15 million dollars but also guaranteed that Mexican citizens living in ceded lands would retain full property rights and would be granted United States citizenship if they remained in the ceded lands for at least one year. This Treaty and others led to the establishment of the International Boundary and Water Commission in 1889 which was tasked with the maintenance of the border, the allocation of river waters between the two nations, and provision for flood control and water sanitation although the treaties and the IBWC itself have been criticized for anti-Mexican bias.