Sega was actually created by Americans.

SErvice GAmes started out in 1945 in Honolulu, Hawaii, as a partnership by father-son team Irving Bromberg and Martin Gerome Bromberg with James L. Humpert, who worked with the family to manufacture and distribute their slot machines and other coin-operated devices. Irving, already an innovator in the coin-op field, brought some of the first vending machines to Brooklyn (one of the five boroughs of New York City), Boston (the capital of Massachusetts) and Washington, D.C. (the capital of the US) back in 1933. Aimed at military bases for distribution, the junior Bromberg and Humpert were actually working in the US Navy Shipyard at Pearl Harbor during the Japanese attacks of World War II. In 1952 Service Games needed somewhere else to sell their excess amount of games, as the US Congress had prohibited any distribution of gambling machines on military bases in 1951. So, they decided to set up shop around Japan, Korea, basically anywhere where US soldiers were stationed--and it worked well for them.

Meanwhile, in 1954, a businessman and former US Air Force officer, David Rosen, fell in love with Japan after the Korean War and decided to stay there. Originally meant to import art, Rosen Enterprises started to boom after it had imported some US coin-op photo booths. Rosen Enterprises expanded and also started importing other American coin-op games.

Having found huge success, with his imports being found in almost 200 Japanese arcades, Rosen wanted his company to grow even more, and went to Bromberg to do so. In October 1965, the two companies merged to become Sega Enterprises.