Lets talk about the Mushroom Kingdom

[Numberfox]

Taken from the Super Mario Wiki of the original Super Mario Bros story, which I guess explains the original conflict:

"One day, Bowser invades the Mushroom Kingdom. He and his Koopa Troop are jealous of the kingdom, and King Bowser decides to take it for himself. To do this, Bowser casts a spell upon the kingdom and transforms all of its inhabitants into blocks, weeds, and other objects. It is foretold that only the Mushroom King's daughter Princess Toadstool can undo the spell. Knowing this, Bowser kidnaps her. Fortunately, the Mario Brothers learn about the Mushroom Kingdom's problem and race to its rescue.

The player takes the role of Mario or, in the case of a second player, his brother Luigi. The ultimate objective is to race through the worlds of the Mushroom Kingdom, evade Bowser's forces, and save the Princess."

 

http://www.mariowiki.com/Super_Mario_Bros.