神聖同盟
The U.S. government feared the victorious European powers that emerged from the Congress of Vienna (1814–1815) would revive monarchical government. France had already agreed to restore the Spanish monarchy in exchange for Cuba. As the revolutionary Napoleonic Wars (1803–1815) ended, Prussia, Austria, and Russia formed the Holy Alliance to defend monarchism. In particular, the Holy Alliance authorized military incursions to re-establish Bourbon rule over Spain and its colonies, which were establishing their independence.