A bit outside my main interests, but it is a good story, and it certainly adds some context to North American history from 1864 to 1867. (Reading the relevant Wikipedia pages, though, is a lot more efficient.) Shawcross gives a very generous appraisal of Maximilian, and I would have liked to have this complemented by more critical views.
> Maximilian was now free to govern as the benevolent liberal monarch that he had always dreamt of becoming. He passed some of the most progressive laws anywhere in the world. In addition to outlawing corporal punishment and regulating child labour, decrees provided for such unheard-of things as lunch breaks, limits to working hours, and days off. Moreover, debt peonage—a system wherein hacienda owners forced tenants to pay debts through labour—was abolished. Large landowners and factory owners also had to provide free schools and, in some cases, access to water and shelter for their workers.
> Mexico’s creole elite, liberal and conservative, often denigrated the indigenous past as barbaric; Maximilian embraced it as part of modern Mexico. Indeed, he increasingly felt that his empire should rest on Mexico’s majority indigenous population. Liberal land reforms in the 1850s had not only stripped the church of its property, but also declared communal village landholdings illegal, breaking them up for private sale. Maximilian restored rights to shared landownership for indigenous villages.
> as Maximilian dreamed, others were growing aware of an enormous problem: most of Maximilian’s new laws were never enforced. The emperor was at his happiest when overseeing a paper empire, but his state was much greater in his imagination than in reality.
> At enormous cost, however, the Union had emerged from the conflict not only victorious but more powerful than ever, with a veteran army larger than at any point in previous US history. Moreover, bellicose Union generals, now popular war heroes, notably Ulysses S. Grant, were keen to use this army to uphold the Monroe Doctrine and US supremacy in the Americas. For men like Grant, Maximilian’s empire represented a nightmarish mix of papal conspiracy and monarchical European power that, in league with the Confederacy, challenged republican democracy.
> Faverney explained that France must leave Mexico or go to war with the United States. On January 15, 1866, faced with catastrophe or humiliation, Napoleon III wrote to Maximilian. “It is not without painful emotion”, the letter began, “that I am writing to Your Majesty”. Pleasantries out of the way, the French emperor cut to his decision. The impossibility of asking the Corps législatif for more money and Maximilian’s own inability to provide the necessary funds, Napoleon III wrote, “force me to fix a definitive limit to the French occupation.”