Throughout American history many people have immigrated to the United States from other countries. U.S. Citizenship and Immigration Services (USCIS) is the government agency responsible for lawful immigration. American citizens can vote in elections, run for public office, and work for the government.
There are two types of citizenship in the United States. People who are born in America are called native citizens. People who move to the United States from another country can apply for naturalized citizenship. USCIS helps about 680,000 people become naturalized American citizens every year.