>All rocket technology is based on German WWII rocket technology.
No. While von Braun and other German engineers received a lot of attention, his team at Army Ballistic Missile Agency (ABMA) was one of three competing US efforts to launch a satellite in the late 1950s. The Navy's Project Vanguard was the second to launch a US satellite (and would have been the first had its December 1957 attempt succeeded). The formation of NASA brought the three efforts together; Project Mercury used ABMA's Redstone and Air Force's Atlas rockets.
The Soviets took German scientists, too, but returned them to Germany in the 1950s. Sergei Korolev and other Chief Designers of the various USSR rocket-design bureaus (which, unlike NASA, did not come and continued competing against each other) were all native Soviets.
Basically, the Soviets squeezed all they could out of them and didn't need them any more.
They were very, very helpful—much more than the USSR liked to acknowledge—to the early Soviet rocket program, but even with their help, Russia had something like only four ICBMs capable of reaching the US during the "Missile Gap" that JFK in part won the presidency in 1960 over.
No. While von Braun and other German engineers received a lot of attention, his team at Army Ballistic Missile Agency (ABMA) was one of three competing US efforts to launch a satellite in the late 1950s. The Navy's Project Vanguard was the second to launch a US satellite (and would have been the first had its December 1957 attempt succeeded). The formation of NASA brought the three efforts together; Project Mercury used ABMA's Redstone and Air Force's Atlas rockets.
The Soviets took German scientists, too, but returned them to Germany in the 1950s. Sergei Korolev and other Chief Designers of the various USSR rocket-design bureaus (which, unlike NASA, did not come and continued competing against each other) were all native Soviets.