The data reveals a steep curve in the country of origin of new citizens. "Twice as many people born in Mexico became citizens in 2013 as people born in India — the next largest group. Twice as many people born in India became citizens in 2013 than people born in nearly any other country (the exceptions are the Philippines, the Dominican Republic, China, and Cuba)."
The article also analyzes data on where those new citizens live: "Just like new citizens are pretty concentrated in a few countries of birth, they're also clustered in a handful of states — notably California, New York, and Florida." Moreover, "There are 164,792 new citizens living in California. No single country even had close to that many people naturalized as US citizens last year. Even in a country that's still a nation of immigrants, California stands alone."