So has anyone read 1900; or The Last President? By Ingersoll Lockwood? If you haven't, at least check out the last few pages.
Also, worth noting this book was written in 1896. The author also penned, none other than "Baron Trump's Marvellous Underground Adventure" in 1892.
The Last President: https://ia601201.us.archive.org/23/items/1900orlastpresid00lock/1900orlastpresid00lock.pdf
Baron Trumps' Marvellous Underground Adventure: https://archive.org/details/barontrumpsmarve00lock/mode/2up