This is definitely a person becoming a naturalized U.S. citizen who is taking the Oath of Allegiance.
Answer:
In conclusion, historians have identified several causes of the Renaissance in Europe, including: increased interaction between different cultures, the rediscovery of ancient Greek and Roman texts, the emergence of humanism, different artistic and technological innovations, and the impacts of conflict and death.
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Is when a political candidate chooses a running mate, usually of the same party, with the goal of bringing more widespread appeal to the campaign.