Welcome to the US! I think you are in a good field for finding a position, however you may find the job market here to be tighter than in Japan. Since much of our work has left the US, finding a position has proven difficult for some American chemists. Since you are new here, you may find it even more difficult to find a suitable position. I suggest contacting a recruiting firm or just a temporary job placement agency just to get something started. After you have local references and a good performance history, you may find it easier to land that dream job. Good luck!