The document discusses the Franco-Prussian War that occurred from 1870-1871 between France and Prussia. It explores the circumstances leading up to the war, noting that tensions were minimal until July 1870 when a series of events prompted France to declare war on Prussia on July 19th. While the candidacy of Prince Leopold for the Spanish throne was contentious, it alone did not present an imminent situation for war. The document aims to investigate what or who instigated the escalation that resulted in France declaring war on Prussia.