About 20 million immigrants were naturalized U.S. citizens, almost half of the total immigrant population of 42.4 million individuals, according to data from the U.S. Citizenship and Immigration Services. In fiscal year 2014 (October 2014 – September 2015), the most recent year for which complete data is available, 653,416 immigrants became U.S. citizens. USCIS received in total 773,824 applications for citizenship and denied 66,767 petitions for candidates who could not prove the required length of permanent residence in the U.S, were found to lack allegiance to the United States, had bad moral character, and failed the English test or the civics test.
Fifteen percent of those naturalized in the fiscal year 2014 were from Mexico, followed by India with 6 percent, the Philippines and China, each with 5 percent, Cuba, and the Dominican Republic, 4 percent each. Three percent of the new citizens were from Vietnam, another 3 percent from Columbia, 2 percent from El Salvador, and another 2 percent from Haiti.
The number of naturalization applications grew significantly this year. From October 2015 to March 2016, about 440,000 people applied for U.S. citizenship. This represents a 21 percent increase compared to the first two quarters of the fiscal year 2015.
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