Short answers, pulled from the story.
Street Fighter II was designed by Yoshiki Okamoto and Akira Yasuda and utilized Capcom's CP System arcade board. The developers used the CPS-1 hardware to deliver unprecedented graphical fidelity and fluid animations for its time.
Street Fighter II was released for the Super Famicom on the 10th of June 1992 in Japan. The North American release for the SNES followed in August and the European release arrived in December.
The original roster of Street Fighter II featured eight playable characters representing different nations and fighting styles. These characters included Ryu, Ken, E. Honda, Blanka, Guile, Chun-Li, Zangief, and Dhalsim.
The combo system in Street Fighter II came about entirely by accident rather than design. Skilled players discovered that certain moves naturally flowed into others if timed correctly, creating unblockable combinations that became the bedrock of the fighting game genre.
By 1994, an estimated 25 million people in the United States had played Street Fighter II. The game generated enough revenue to become one of the top three highest-grossing video games of all time alongside Space Invaders and Pac-Man.
The Shadaloo organization is led by the mysterious M. Bison. Bison used his organization to establish a base in a temple in Thailand and subjugated a nearby village to fund his global domination plans.