Excerpts from Books and Wikipedia
"With little show of military might, Jackson had virtually extinguished the Spanish presence in Florida. . . . The proclamation also declared that all Spanish subjects would be respected during the occupation, the Spanish laws would govern in cases involving property and persons, that religious toleration would be guaranteed and trade with all nations assured. The proclamation then announced the establishment of a provisional government for the Florida province. . . . The arrogance of the proclamation was positively colossal, worthy of the great Napoleon. In one stroke Jackson redirected governmental authority under powers he assumed by virtue of military conquest. . . . Fortunately for Spain, Jackson's health necessitated his return to Tennessee--otherwise he was ready to pursue the Spanish to Cuba. He was now a ranting nationalist in full cry, obsessed with the safety of the frontier and the 'growing greatness of our nation.' . . . Thus, Canada gone, it hardly took much imagination to recognize that future American expansion must come at the expense of a crumbling Spanish empire. The seizure of Florida renewed the spirit of American expansion."