This chapter analyses the background to foreign wrestlers’ rapid increase after the 1990s. The collapse of the Soviet Union in 1991 and the subsequent Eastern European Communist state regime transitions accelerated sumo world globalisation. Wrestler influx from Mongolia, Russia, and Eastern European countries stemmed from these countries’ economic hardships. During the Communist era, states supported athletes, but post-collapse many lost their means of livelihood. Japanese sumo offered attractive employment opportunities. Data analysis confirms the rapid increase in Mongolian wrestlers in Japan following Communism’s collapse, supporting global labour mobility theory. Greater economic disparity heightens labour migration incentives. Foreign wrestler networks compensated for market imperfections, mitigating information asymmetry. Senior wrestlers’ success created notable chain effects encouraging junior recruitment. Sumo world globalisation closely relates to world political-economic fluctuations. The paradoxical situation emerged where traditional Japanese culture sumo stood at globalisation’s forefront. The chapter demonstrates how global political-economic transformations directly impact traditional cultural institutions, offering insights into globalisation’s uneven development and its effects on traditional societies.