Why did the people of Mexico want independence from Spain?

By the 19th century many Mexicans wanted to separate from Spain and create a sovereign government that would act on behalf of their own interests much like the movement for American independence from British rule in the late 18th century. The desire for independence from Spanish rule first formally emerged in 1810.

Explanation:

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.