The question is what would happen in America to make them want to move the Warehouse again? Warehouse 11 shut down due to the aftermath of Napoleon's attempt to invade Russia. Warehouse 12 shut down due to the onset of World War I.
Have they said either of those two on screen? I would've thought WWII represented the end of the Empire more than WWI.
My knowledge of Russian history is extremely flaky but how would Napoleon's failed invasion attempt represent the "fall" of Russia - or was it more a case of the Empire overtaking Russia?