And you are forgetting - no you never knew - that Warner Von Braun and his colleagues based their programs on the experiments made by the American rocket scientist, Dr. Robert H. Goddard in the early 1900's. In 1914, Goddard was awarded the patent for the liquid fuel rocket and the multi-stage rocket. The German Rocket Society of 1927 was founded upon Goddard's writings on his rocket experiments. They considered Goddard their "Founding Father".
BTW, Willie Messerschmitt also used American, "NACA", airfoil sections in the ME-109 and 262. The immortal R.J. Mitchell, the designer of the Supermarine "Spitfire", also availed himself of US aerodynamic research from Langley in the design of the excellent wing of that airplane.
In the final analysis, all the "Vunder Veapons" that the Krauts invented were actually copies of someone else's work, usually American. On May 7, 1945, all air, land and sea forces, as well as all the weapons of the "Third Reich", were either damaged, destroyed, or captured by the Allied Forces. After all is said and done, Nazi Germany was nothing but a looser.
You have a pissy attitude!