Indigenous peoples of Mexico
When Mexico gained independence in 1821, the casta system was eliminated as a legal structure, but racial divides remained. 
White Mexican argued about what the solution was to the "Indian Problem", that is indigenous who continued to live in communities and were not integrated politically or socially as citizens of the new republic. The Mexican constitution of 1824 has several articles pertaining to indigenous peoples. The second article of the constitution of Mexico recognizes and enforces the right of indigenous peoples and communities to self-determination and therefore their autonomy to:
1840s
The Republic of the Rio Grande declared its independence from Mexico in January 1840. However, the border with Texas was never determined (whether the Nueces River or the Rio Grande). The new Republic fought a brief and unsuccessful war for independence, returning to Mexico late in the year.