Why did you think that Rainsford chooses to confront Zaroff in the end, rather than simply ambush him?

He wants Zaroff to feel like he's being hunted.  Rainsford has now tracked him down and his him on an even playing field.  Zaroff is now the one who has to fight to stay alive.  Aside from this, I think an ambush would be pretty difficult.  Rainsford is unarmed and Zaroff is tucked away somewhere in his great chateau.  A sneak attack probably wouldn't be successful.

he was in office from 1929 to 1933 and served as a reform governor, promoting programs to combat the economic crisis besetting the united states at the time. in the 1932 presidential election, roosevelt defeated republican president herbert hoover in a landslide.

explanation:

the tallest building in the western hemisphere and the sixth tallest building in the world