Hello Gilles, my name is ***** ***** I am delighted to answer your questions today. I have 35 years experience as an immigration lawyer.
First, don't be nervous as you have not done anything wrong.
What you do need to do is to do a formal abandonment of your resident status since you have under the law abandoned it by residing outside the US for more than one year. It is a simple process to give it back.
This is the form I-407
It is filed, by mail or courrier with the international USCIS field office for your country which I believe would be Germany.
The USCIS will acknowledge receipt and that the record has indicated formal abandonment.
That will then allow you to use the ESTA program to enter the US for your business travel if you will be here for less than 90 days. You can apply for ESTA online
I would recommend that your wife and daughter also file the I-407 since they no longer would be eligible for entry into the US under their existing card because of abandonment.
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