Americans questions

Presley was introduced to karate by The Army, during his service in Germany. He included some karate moves in his live performances.

Iggy Pop's father, who was of Irish and English descent, was adopted by a Swedish American family and took on their surname (Österberg).

John Davison Rockefeller was the founder of the Standard Oil Company, which dominated the oil industry in the U.S. As kerosene and gasoline grew in importance, Rockefeller's wealth soared, and he became the world's richest man and first American worth more than a billion dollars.

Armstrong experienced growing problems with his lips and fingers, which were aggravated by his unorthodox playing style. As a result, he branched out trumpeting, developing his vocal style and making movie and radio appearances.

These families are Bush (George H.W. and George W.) and Adams (John and John Quincy).