https://www.voxespana.es/biblioteca/espana/2018m/gal_c2d72e181103013447.pdf
https://www.v-dem.net/files/25/DR%202021.pdf
https://theconversation.com/mexico-has-elected-its-first-female-president-claudia-sheinbaum-inherits-a-country-ravaged-by-violence-and-searching-for-hope-231475