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