The United States government prioritizes public access to government information, including data produced in federally funded research. The 2013 Public Access to Federally Funded Research memo from the White House Office of Science and Technology Policy directed all government agencies to develop for public access requirements for data produced in funded projects.
The Scholarly Publishing and Academic Resources Coalition (SPARC) tracks article and data sharing requirements for federal agencies. See current and forthcoming policies by federal agency.
Sherpa Juliet is a searchable database and single focal point of up-to-date information concerning funders' policies and their requirements on open access, publication and data archiving.