Answer:
Barack Hussein Obama II is an American attorney and politician who served as the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African American to be elected to the presidency.
Explanation:
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“whose father worked for the railroad” is a subordinate clause as it is a relative clause beginning with the pronoun “whose”. It is particularly used in written English and it refers to possession of things or to make association or connections with other things or people.