I do believe you have your facts backwards, Gary.
The US was known for precision bombing. At least, they tried to be. The Norden bombsight was a great device, but at high altitude it would still drop bombs up to 1/5 mile off-target. It was from the Brits that the US actually learned how to carpet bomb. Just fly a massive armada of bombers over a target and once the lead bomber started dropping bombs, all others followed suit.
That's why in 1942 the Norden bombsight was all but declassified. Because instead of trying to hit targets with bombs the US Army had learned from the English to just engulf it with bombs.