Germans did have a bomber that could reach America in WW II—but it could not return to Europe. BUT with a nuke a one way trip would have been possible. Crew could ditch over Atlantic to be recovered by a U-Boat. They even talked about such things to hit New York—But it was practice with conventional bombs—but with a nuke—even a dirty bomb it might have been worth it. Japan even thought of hitting the USA with a plague bomb they perfected in China. One way attack on San Francisco or San Diego. They would have gladly given up a plane and crew to hit a US city.
I have heard of Japanese projects to attack the American mainland, but, iirc, there were balloon bombs launched by the Japanese, supposedly to cause forest fires in the Western US.
Tragically, six civilian Americans on a picnic in May 45 were killed when one of these Fu-Go bombs went off near them.
IIRC, they had found it in a forest, believing it to be a dud, and wanted to lift it off the ground. I have no clue why the unfortunates didn’t run and alert the UXO department.
Then it went off. May the six Americans who were killed by the blast rest in peace✝️
But bombers with a range of 4,500 miles, i.e. from Brittany, the westernmost part of occupied Europe, to the American East coast? And that is one way.
I am no expert on World War Two, but iirc, bombers had much shorter ranges in those days, even the dreaded Avro Lancaster.
Furthermor, afaik, American radar was so good after 1943, that such a German bomber would definitely have been intercepted.