Theodore Roosevelt only won the 1898 New York gubernatorial election very narrowly, read https://en.wikipedia.org/wiki/1898_New_York_state_election. What if he had lost to Augustus Van Wyck? I doubt that he would have been William McKinley's running mate in 1900, in this timeline. Who would McKinley have chosen as running mate, in this timeline? Assuming that McKinley's assassination isn't butterflied away, that person would have become President of the USA. Would Theodore Roosevelt have, ever, become President of the USA, in this timeline? What would the USA of this timeline look like?