California leads the nation in naturalized citizens

In 2017 in California, nearly twice as many people became naturalized citizens than in the state with the second most, New York. Of the more than 700,000 people that were naturalized that year, the median time spent as a lawful permanent resident was eight years.
Naturalized citizens by year 
Number naturalized by state, fiscal year 2017
Regions of origin, fiscal years 2008–2017
Thirty-seven percent of people who were naturalized in 2017 were born in North America, followed by 36% bor