Why would the action of Agustin de Iturbide make the difference in Mexico's
war for independence?

Why? Well, he worked very hard for many people in Mexico to have a place to call home, and for people in the future to have a better. Mexico's war for independence was a really hard time back then for many.  Securing the secession of Mexico from Spain, Iturbide was proclaimed president of the Regency in 1821; a year later, he was announced as the Constitutional Emperor of Mexico, reigning briefly from 19 May 1822 to 19 March 1823.

Explanation:

Not much to say. Have a marvelous rest of your day. :)

what are the following?

explanation:

the south did not want the federal laws to overrule the state laws.