USCIS – Case Status Online
https://egov.uscis.gov/casestatus/landing.do
US Department of State – Visa Status Check
https://ceac.state.gov/ceacstattracker/status.aspx
US Department of Homeland Security – I-94 Website
https://i94.cbp.dhs.gov/I94/#/home
US Citizenship and Immigration Services
US Immigration and Customs Enforcement
Executive Office for Immigration Review