Yes!
Dual citizenship/nationality is permitted in the UK, which means you can be a British citizen while also being a citizen of other countries. That includes the USA. Read more on the government’s official webpage here.
At the same time, U.S. law does not require U.S. citizens to choose between their U.S. citizenship and another nationality (or nationalities). A U.S. citizen can naturalise in a foreign state without any risk to their U.S. citizenship.
The Department of State website states:
U.S. law does not impede its citizens’ acquisition of foreign citizenship whether by birth, descent, naturalization or other form of acquisition, by imposing requirements of permission from U.S. courts or any governmental agency. If a foreign country’s law permits parents to apply for citizenship on behalf of minor children, nothing in U.S. law impedes U.S. citizen parents from doing so.
U.S. law does not require a U.S. citizen to choose between U.S. citizenship and another (foreign) nationality (or nationalities). A U.S. citizen may naturalize in a foreign state without any risk to their U.S. citizenship.
U.S. dual nationals owe allegiance to both the United States and the foreign country (or countries, if they are nationals of more than one). They are required to obey the laws of both countries, and either country has the right to enforce its laws. Claims of other countries upon U.S. dual-nationals may result in conflicting obligations under the laws of each country. U.S. dual nationals may also face restrictions in the U.S. consular protections available to U.S. nationals abroad, particularly in the country of their other nationality.

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