English version

United States Citizenship and Immigration Services

From Longman Dictionary of Contemporary EnglishUnited States Citizenship and Immigration Services United States Citizenship and Immigration Services (abbreviation USCIS)  a US government organization that is part of the Department of Homeland Security. It is responsible for immigration matters and has the power to decide whether or not someone can become a US citizen, live in the US, or claim asylum (=live in another country because it is not safe to live in your own country).
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