In the early 1970s, while Yonezawa was still a senior teacher at the Kodokai, he was the first person to bring Daitō-ryū Aiki-jūjutsu to the United States and Canada.
Tidligt i 1970erne, mens Yonezawa stadig var en af de mere erfarne instruktører i Kodokai, var han den første, der bragte Daitō-ryū Aiki-jūjutsu til USA og Canada.