Share This Article 1. On 10 April 1864 this man declared himself Emperor of Mexico. Ferdinand VII of Spain Joseph Napoleon III of France Don Pedro II of Brazil Archduke Maximilian of Austria 2. The so-called “July Plot” to kill Hitler is often referred to by this code name. Operation Valkyrie Operation Savior Operation Downfall Operation Wolfkill 3. Sometime around 1781 James Monroe named his estate this. Long Branch Mount Pleasant Montpelier Brookwood Loading …