<p>OP became an US citizen through naturalization. By law:
“People who go through US naturalization are required to state under oath that they are renouncing their old citizenship, and conduct inconsistent with this pledge could theoretically lead to loss of one’s US status.” Even though immigration is not enforcing it, strictly speaking OP has renounced his UK citizenship when he became an American citizen. It is also to his benefit now to be an American when applying to US universities.</p>
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