What are the visa & residency requirements in Washington DC?

"In order to obtain a visa to live and work in Washington DC, applicants must first submit an application to the United States Citizenship and Immigration Services (USCIS). This application must include proof of identity, proof of financial support, and a valid passport. Once the application is approved, the applicant will receive a visa that allows them to enter the United States. In order to apply for residency in Washington DC, applicants must first submit an application to the USCIS. This application must include proof of identity, proof of financial support, and a valid passport. Additionally, applicants must provide evidence of their intent to live and work in the United States, such as a job offer or proof of enrollment in a school or university. Once the application is approved, the applicant will receive a green card that allows them to live and work in the United States," remarked another expat in Washington DC, the United States.