申请美国公民已经两年多

I applied for US citizenship more than two years ago in Dallas, Texas. I already have had two fingerprints and two interviews with them. But so far haven't got it yet. USCIS said the delay is due to FBI's name check. Then I sent enormous letters to the Senator and Congressman. The Senator never replies. The congressman said he could not help.

I don't know if anybody has any similar experience as I. Anybody there can help? I really need it for my future career and family planning.

Thanks a million!