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You can go to the local DMV or Public Safety Department (i.e., the office which issue driver license) to get a copy of your driver record. If you have violation of traffic on your driver record, then report it in N-400.

 

护照上日期好像入出境时间对不上

-Review your passport for entry/exist stamps from China. Difference of a few days does not matter.

You may also check your flight records from the airlines website or APP.

Another choice: To get your exact oversea travel history, you can request it with CBP via FOIA which may take several months.  See this link:

 Request Records through the Freedom of Information Act or Privacy Act | USCIS