This is a report on Overseas Teaching Practicum by Graduate Students in Elementary / Secondary Schools in the United States. As globalization of the society has been accelerated in an unprecedented rate, children in the 21st century need to develop heightened awareness as global citizens; similarly, future teachers need to develop enhanced awareness and skills in teaching young global citizens in the future. For this purpose, Global Partnership School Center, Hiroshima University, launched an overseas teaching practicum by graduate students in elementary / secondary schools in the state of North Carolina, United States. Reviewing the process from pre-program workshop to post-program workshop, a multi-national international collaboration model in education was suggested.