Roosevelt returned to the United States in May 1914 . Though he was outraged by the Wilson Administration 's conclusion of a treaty that expressed " sincere regret " for the way in which the United States had acquired the Panama Canal Zone , he was impressed by many of the reforms passed under Wilson . Roosevelt made several campaign appearances for the Progressives , but the 1914 elections were a disaster for the fledgling third party . Roosevelt began to envision another campaign for president , this time with himself at the head of the Republican Party , but conservative party leaders remained opposed to Roosevelt . In hopes of engineering a joint nomination , the Progressives scheduled the 1916 Progressive National Convention at the same time as the 1916 Republican National Convention . When the Republicans nominated Charles Evans Hughes , Roosevelt declined the Progressive nomination and urged his Progressive followers to support the Republican candidate . Though Roosevelt had long disliked Hughes , he disliked Wilson even more , and he campaigned energetically for the Republican nominee . However , Wilson won the 1916 election by a narrow margin . The Progressives disappeared as a party following the 1916 election , and Roosevelt and many of his followers permanently re-joined the Republican Party
1916 Republican National Convention
1916 Republican National Convention
Theodore Roosevelt