Task: Question Answering
Input (English): Also during june , metal gear solid and guitar hero on tour topped the game sales charts as nintendo wii and nintendo ds topped the console sales charts . W i i - here is the first sales report of nintendo wii in japan , between december - nintendo shipped , units of wii in japan and sold through , units in the . The latest console - sales figures to be released from npd group reveal that the wii has overtaken the xbox in being the most purchased console in the us . With the newest sales results , the wii is now officially the top selling console in the united states for this generation hardware nintendo ds - , 000 ; nintendo wii - , . 
Question: Why did the wii overtake the xbox in being the most purchased console in the us ?
Output (English): Because more people purchased the wii than the xbox .