Citizenship

Hello I just came back from my interview. My time is 2:15 pm. I arrived at 1:30 pm. First checked in at first floor and then go to the third floor checked in again. They gave the number and waited to be called, my number is M639. I began waiting to be called from 1:55pm. This waiting is still long until 3:05. the IO called me. So I waited more than one hour. Anyway I am nervous at the beginning, my IO just did what he should do, raise right hand to swear to tell the truth, sit down to show passport, green card and driver's license, take pic and check index fingerprint left and right. Next read. What state has the most people? Write. California has the most people. and then go through my N400. At last double check name and sign. Gave me a sheet of paper to congrats recommended for approval. Nothing else to ask. Shake hands and say have a good evening let me leave.