If Foster wasn't his birth name, maybe it was "Voslauer". That's an Austrian name and since no American could pronounce it, it was changed to Foster, George Gershwin (famous "American composer" of "Rhapsody in Blue", "Summertime") was a Russian jew. Americans are taught from an early age that all good people are 100% American and the bad guys are always Germans. It's part of their propaganda program. They forget that about 40% of the caucasian population came from Germany. That's called DENIAL.
