What does the president swear to uphold when reciting the presidential oath of office?

the oath of office of the president of the United States is the oath or affirmation that the president of the United States takes after assuming the presidency but before exercising or carrying out any presidential powers or duties.

Explanation:

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a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.