Yes, that was his “American experience.” Which was liberally supplemented by his most impressionable learning years spent in Indonesia. Possibly elsewhere too as he has said he lived in other countries without ever saying where or when.
BTW, speaking of “walking,” I remember the first time I was in Paris, about40 years ago. My wife and I were following some blacks guys down the street. I thought there was something “funny” about them. They didn’t walk like the black guys I knew. It turned out they were Africans living in Paris. I have since discovered that American blacks walk like Americans. Back during WWII, Brits would comment on the
“loose” walk of American GIs. I have also noticed that among Americans, the more athletic they are, the more they tend to have a rolling gait. The GIs were, of course, physically fit.