https://www.wsj.com/articles/how-the-u-s-won-world-war-ii-without-invading-japan-11583698141?mod=opinion_lead_pos10
The U.S. entered World War II in 1941. Yet American planes couldn’t dent a roof in Japan until 1945. The 1942 Doolittle raid, with its 16 bombers that took off from carriers, showed great ingenuity and bravery. But it had zero impact on Japan’s ability to make war.
The raid was designed to boost morale after Pearl Harbor. When the U.S. didn’t follow up with more attacks, the Japanese believed their homeland was invulnerable to enemy bombs because of the emperor’s divine presence. That hubris ended 75 years ago Monday with an event that set in motion the eventual U.S. victory.
First, a little more history: The U.S. could reach Japan only after the Marines took the Mariana Islands at great cost in 1944. The largest airports in the world were built within months and filled with new, modern B-29 bombers. The B-29 was a marvel and the greatest expense of the war at $3 billion, compared with $2.4 billion for the Manhattan Project. Each plane was three times the size of the next-largest bomber, the B-17. The B-29 could fly 3,700 miles and cruise at an altitude high enough to elude antiaircraft fire.