The Denver Post has published a series of 70 photographs of America in the early 1940’s. All are sourced from the Library of Congress, so they are, by definition, in the public domain. I’ve chosen only five to reproduce here, in smaller scale, to whet your appetite to go and look at the collection as a whole.
This is the original Allison-engined version, ordered by Britain as the Mustang 1A.
Note the 4 x 20mm. Hispano cannon armament.
There are many more at the link, all larger than those reproduced here. They’re a fascinating look at this country in the early years of World War II, with the added benefit of color, which is lacking in so many photographs of the period. Highly recommended for anyone interested in living history.
Peter