A foreign national who is not a resident of the United States will in many cases seek to own real estate.
Financing real estate is generally done by US mortgage companies and banks to United States citizens.
Down payment requirements are usually higher for foreign national borrowers.
There are agencies in the US that obtain the data, conform it to US regulations and provide the background checks (verification of employment, verification of an existence of a company for self-employed) and anti-money laundering, anti-terrorism, OFAC and red flag rules.
Most lenders will require 2 years of personal tax returns, copies of bank statements, proof of employment just to name a few documents and they will have to be translated.