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