For example: 

• Change of address; 
• Change of marital status; 
• Death of petitioner; 
• Birth or adoption of additional children. 

With a few exceptions, a person born in the United States has claim to U.S. citizenship. A person born outside the U.S. may have a claim to U.S. citizenship, under United States law, if either parent was:   

• A U.S. citizen at the time of their child's birth, and 
• Lived in the United States for a specific period of time prior to the child's birth.

If you may have a claim to United States citizenship, you should not apply for a visa until your citizenship status has been determined by a consular officer. Please contact the American Citizens Services unit at the Embassy for evaluation of a claim to US citizenship. 

If you have any children who intend to immigrate with you to the United States , please be aware that in order to immigrate with you to the United States , your children must be unmarried, eligible to be listed under your visa classification and under the age of 21 at the time they enter the United States. If any of your children will turn 21 within 120 days, please notify this office. 

At the port of entry DHS officials will take the immigrant visa and assign each immigrant an "alien number." They will stamp the immigrant’s passport with this number and make a notation that you are registered for an I-551 alien registration card ("green card"). 

It normally takes several months for DHS to process and send you the alien registration card . In the interim the passport stamp permits employment and travel until the card arrives. You may depart and return to the U.S. before you receive the alien registration card, as long as the DHS stamp in your passport has not expired. 

Should you wish to leave the U.S. and your stamp has expired and you have not yet received your alien card, you should contact DHS in the U.S. before departure to ensure you have permission to return to the U.S. If you plan to remain outside the U.S. for more than 12 months, you must apply for a re-entry permit in the U.S. BEFORE departure. This re-entry document is valid for a maximum of two years. Without a re-entry permit, any absence from the U.S. of 12 months or longer, or any residence established outside the U.S. , is grounds for loss of your permanent resident status.

If you are permanently relocating outside the US , you can formally abandon your permanent resident status at a US embassy overseas.