Explain why Theodore Roosevelt challenged his hand-picked successor. what was the outcome

Pressured by the progressive wing of the Republican Party to challenge Taft in 1912, Roosevelt weighed his options. Eventually he decided to throw "his hat into the ring" and run against his former protégé.

The Republicans met in Chicago in June 1912, hopelessly split between the Roosevelt progressives and the supporters of President Taft. Roosevelt came to the convention having won a series of preferential primaries that put him ahead of the President in the race for party delegates. Taft, however, controlled the convention floor, and his backers managed to exclude most of the Roosevelt delegates by not recognizing their credentials. These tactics enraged TR, who then refused to allow himself to be nominated, paving the way for Taft to win on the first ballot.

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nativists tried to get rid of the immigrants as they thought they were going to ruin the u.s.  

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