America's Public Land Act of 2019 This bill reaffirms that it is U.S. policy to retain public land in federal ownership unless its disposal has been authorized by an Act of Congress; to retain management authority over public land, except where a nonfederal individual or entity is authorized to exercise management authority pursuant to an Act of Congress or another applicable law; and that retention of public land and the management authority over it is in the public interest. Neither the Department of the Interior nor of Agriculture shall approve or permit the conveyance of public land or the granting of management authority over such land to nonfederal individuals or entities except as authorized by an Act of Congress.