For a few years in the middle of the nineteenth century, Mexico was ruled by an Austrian and defended by a French army. This often neglected story is more than just historical trivia - it's a way of understanding 19th century imperial politics, and global insurgencies today. In Habsburgs on the Rio Grande: The Rise and Fall of the Second Mexican Empire (Harvard UP, 2024), University of Washington professor Raymond Jonas explains the genesis, course, and end of this strange twist in the historical record. Jonas argues that, even deep into the nineteenth century, a successful American republic posed an existential threat to European monarchies, so much so that in the early 1860s a combined force of Spain, France, and Britain sent soldiers to North America to impose a monarchy on an unwilling population. The Second Empire under Emperor Maximilian I was short lived, however, and his rule never extended much past the capital city. Yet as Jonas argues, the fact that Mexican anti-monarchist partisans could fight the might of Europe and oust the monarchy has lessons to teach today about autocracy and resistance in the early twenty first century.