Why are most video games made in Japan

Most video games are not made in Japan. However alot of the companies that make the consoles are (They then created offices in different countries) A lot of games are created in America and even England. If you're thinking of companies such as Nintendo (Japan based) they created the games so their consoles have some games at launch. you will find that if a company is largely based in Japan they will make the game there but it is still then shipped to their offices in other countries for editing and translation. When video games became hugly popular the original games were created in Japan, now America has a massive income from video games. (Microsoft - xbox/360 are American based)