Fan War #1: Nintendo vs SEGA

This is one of the biggest competitions in video game and media history, next to Microsoft vs Apple, Capcom vs SNK (not the game), and Activision vs Bungie. This one is huge, especially with the fans.
The combatants:
Nintendo
-Systems: Game & Watch, NES, GameBoy, SNES, N64, GameCube, DS, Wii, 3DS, Wii U
-Games: Mario, Donkey Kong, The Legend of Zelda, Star Fox, Pokemon
SEGA
-Systems: SG-100, Master System, Genesis, Saturn, Dreamcast
-Games: Sonic the Hedgehog, Ecco the Dolphin, Golden Axe, Alex Kidd, Billy Hatcher
History:
This fan war goes way before when Sonic came into our lives. Nintendo's NES and SEGA's SG-100 were released during the same year (1983) and the NES had instantly been more popular than SEGA's creation. However, with Nintendo having released the SNES, which was a major success, SEGA caught up with the Master System and the Genesis. That's when Mario and Sonic's rivalry began. Finally, Nintendo released the Nintendo 64, which is still very popular today. SEGA decided to make a huge step and released the Dreamcast two years after the release of the N64, giving the N64 a long time to shine, and shine it did. The Dreamcast was a success, until Sony made a huge move releasing the PS2, which basically became a third party in the war, only being the one to nearly end it...in a bad way. This was weird because the PS1 was a huge success, but didn't do any damage to other companies. The PS2, however, ended up being far more recognized than the Dreamcast, and eventually the N64 was gone too, but in a less brutal way. SEGA had decided to quit the console business and stick to game development. Microsoft took the empty spot and released the Xbox, giving the Nintendo GameCube double trouble with Xbox and the PS2, which were quite the fighter, especially with Microsoft buying company after company, such as Rare (ending Banjo-Kazooie and its partnership with Nintendo) and Bungie and the PS2 still selling games until last year. SEGA began to release their games for all systems available at the time (GameCube, PS2, Xbox). From there, SEGA and Nintendo began to help each other out and patching up the battle wounds they both had been trying to heal for years. This resulted with the two companies being in a peace they've owed each other for decades.