The Republican Party attempted to limit the influence of Theodore Roosevelt by nominating him as vice president to William McKinley in 1900. At that time, many party leaders viewed him as a potential threat due to his popularity and progressive reforms. By placing him in the vice presidency, they aimed to sideline him, as the vice president traditionally had less power and visibility compared to other political roles. This move ultimately backfired when McKinley was assassinated, and Roosevelt ascended to the presidency, where he would become a significant and influential leader.
So, the correct answer is: Roosevelt was nominated vice president to William McKinley.