I got my green card in 2015 based on employment. After I moved to state, my sponsoring employer told me they don't have any jobs for me. I lived in NYC that time with $1000 saving. I needed to pay for my bills and rent. I ended up finding my own job in the same field. My sponsoring company have never contacted me in the past 5 years. We don't have anything in writing that they unable to provide me with jobs. I am thinking about applying for citizenship, but I am concerned I might get asked if I ever work for my sponsoring employer. Does anyone have the same situation and get their citizenship without issues? Does IO go through all the employment history during the interview?