I beg to differ...Robert Goddard (American) is a god in the pantheon of rocketry.
In 1919, the Smithsonian Institution published Goddard's groundbreaking work, A Method of Reaching Extreme Altitudes. The report describes Goddard's mathematical theories of rocket flight, his experiments with solid-fuel rockets, and the possibilities he saw of exploring the earth's atmosphere and beyond. Along with Konstantin Tsiolkovsky's earlier work, The Exploration of Cosmic Space by Means of Reaction Devices (1903), Goddard's little book is regarded as one of the pioneering works of the science of rocketry, and is believed to have influenced the work of subsequent pioneers such as Hermann Oberth, Wernher von Braun and Sergey Korolev.
An don't forget the Pederson device and Thompson of WWI (American). If that didn't start the trend of "select fire/auto, less than full rifle cartridge, large cap magazine" I don't know what did.
Oh and how about the proximity fuse and radar?
My understanding is that the Pederson device was a flop, The Thompson didn't come out till well after WWI that's why it was called the M (model of ) 1927 Well after the model 1896 Mauser had been sold in Full auto versions and after the Erma sub machine gun. And it's irrelevant anyway, every one had Submachine guns, they called them "machine pistols" because they were PISTOL caliber. The reason the Germans wanted an "assault rifle" was because the pistol calibers weren't doing the job.
All your claims for Goddard are pointless, sure he did the research, but it was the Germans who did the ENGINEERING that changed theory into reality, the V-2 is still in service today slightly updated as the Scud.
The Germans also pioneered the Cruise missile (V-1)that we used after the war as a target tug, and the guided bomb (Fritz X)
Radar was a British development that Marconi had working before the war, how do you think they won the "Battle of Britain"?