Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The United States biological weapons program officially began in spring 1943 on orders from U.S. President Franklin Roosevelt. Research continued following World War II as the U.S. built up a large stockpile of biological agents and weapons. Over the course of its 26 year history, the program weaponized and stockpiled bio-agents, such as anthrax, tularemia and brucellosis. Learn more about the United States biological weapons program, its history and weaponized bio-agents in the following pages.