equation
-
USA: P-38, P-39, P-40, P-47 (and P-51)
Did the US spread its resources too thin on four (five including the P-51) fighters? Should the US have concentrated resources on one or two, rather than four/five? The P-51 probably fits into this equation as well. The P-51 probably could have have accomplished the work of all four/five. PS...