1. United States Citizenship and Immigration Services

https://www.uscis.gov/

 

2. Check your case status online

https://egov.uscis.gov/casestatus/landing.do

 

3. Social security administration

https://www.ssa.gov/

 

4. List of United States Embassies

https://www.usembassy.gov/

 

5. Visa Bulletin

 https://travel.state.gov/content/visas/en/law-and-policy/bulletin.html