Which non-European power would create the most chaos if it received a World War II-era navy at the start of the twentieth century?
Short answerThe Ottoman Empire would disrupt the most powers by threatening Suez and changing its relations with Russia, Austria-Hungary, Italy, France, Britain, Germany, and the United States; Brazil would produce the funniest American reaction.
NotesThe Ottoman Empire is the most disruptive choice because a modern battle fleet would sit directly across British access to Suez and unsettle nearly every nearby great power. It would also weaken Ottoman dependence on Germany, changing Berlin's route into the Middle East. Brazil is the alternative because even its historical dreadnought purchase alarmed the United States, and a vastly stronger fleet would trigger extraordinary American funding. A navy's geopolitical effect depends on where it appears as much as on its ships.