What did Peter Force invent?

Answer 1

The holdings of Americana in the Library of Congress owe much of their strength to the collecting zeal of Peter Force (1790-1868). In the course of preparing his "Documentary History of the American Revolution," a compilation better known today as American Archives, this Washington publisher and politician assembled what was probably the largest private collection of printed and manuscript sources on American history in the United States. The Peter Force Library was purchased by act of Congress in 1867. In one stroke, the Library of Congress established its first major collections of eighteenth-century: American newspapers, incunabula, early American imprints, manuscripts, and rare maps and atlases.