AH challenge: "some scion of the House of Hapsburg installed as Emperor of the United States"

From Richard Hofstadter's legendary "The Paranoid Style"

Two books which appeared in 1835 described the new danger to the American way of life and may be taken as expressions of the anti-Catholic mentality. One, Foreign Conspiracies against the Liberties of the United States, was from the hand of the celebrated painter and inventor of the telegraph, S.F.B. Morse. “A conspiracy exists,” Morse proclaimed , and “its plans are already in operation . . . we are attacked in a vulnerable quarter which cannot be defended by our ships, our forts, or our armies.” The main source of the conspiracy Morse found in Metternich’s government: “Austria is now acting in this country. She has devised a grand scheme. She has organized a great plan for doing something here. . . . She has her Jesuit missionaries traveling through the land; she has supplied them with money, and has furnished a fountain for a regular supply.” Were the plot successful, Morse said, some scion of the House of Hapsburg would soon be installed as Emperor of the United States.

“It is an ascertained fact,” wrote another Protestant militant,

that Jesuits are prowling about all parts of the United States in every possible disguise, expressly to ascertain the advantageous situations and modes to disseminate Popery. A minister of the Gospel from Ohio has informed us that he discovered one carrying on his devices in his congregation; and he says that the western country swarms with them under the name of puppet show men, dancing masters, music teachers, peddlers of images and ornaments, barrel organ players, and similar practitioners.

Anti-Catholic wingnuttery aside, how could the Austrians somehow meddle in American affairs enough to get one of their own upon the throne? I think first they should have him elected president, and then he could take emergency powers. Is there any equivalent to Maximilian north of the Rio Grande? Who might have a native-born son?
 
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