https://api.usaspending.gov/api/v2/agency/028/budgetary_resources/
https://api.usaspending.gov/api/v2/agency/028/program_activity/?fiscal_year=2020
https://api.usaspending.gov/api/v2/agency/028/federal_account/?fiscal_year=2020
https://api.usaspending.gov/api/v2/federal_accounts/028-8704/?fiscal_year=2020
https://api.usaspending.gov/api/v2/federal_accounts/028-8704/program_activities/?fiscal_year=2020
References updated.
https://api.usaspending.gov/api/v2/federal_accounts/5069/fiscal_year_snapshot/2020/ https://api.usaspending.gov/api/v2/federal_accounts/5069/fiscal_year_snapshot/2021/ https://api.usaspending.gov/api/v2/federal_accounts/5069/fiscal_year_snapshot/2022/ Amtrak federal links.