American Arsenal: A Century of Weapon Technology and Strategy - Patrick Coffey - Google Books

https://books.google.de/books?id=1XX1AQAAQBAJ&pg=PA191

When America declared war on Germany in 1917, the United States had only 200,000 men under arms, a twentieth of the German army's strength, and its planes were no match for the Luftwaffe. Less than a century later, the United States today has by far the…