This describes a "Twilight Zone"-ish parallel universe of what might have happened if the Nazis won World War II. There have been many alternative history scenarios written that explore just such a tragic ending to the deadliest war in human history. The possibility of a Nazi victory is not too farfetched.
In my time-warped universe, President Franklin Roosevelt does not run for a third term in 1940. Republican Senator Robert Taft wins the White House. Because Taft is a staunch isolationist, the Japanese decide against doing a reckless, preemptive attack on the U.S. fleet at Pearl Harbor.
America is finally forced to enter the war following the fall of Great Britain. But it's too late. The Nazis have had time to perfect rocket-propelled intercontinental bombers among other super-weapons.
Though the alternative future that would have followed a Nazi victory is pure conjecture, the German road to space is much clearer. In the late 1940s and early 50s the writings of German rocket pioneer Wernher von Braun (shown above), who first developed liquid fueled rockets as military weapons, spelled out the strategy he would have used to go beyond Earth.