Qatar's Emir Sheikh Hamad bin Khalifa Al-Thani was in attendance in Zurich, and he thanked Fifa for "believing in change".
"We have worked very hard over past two years to get to this point," Al-Thani continued. "Today we celebrate, but tomorrow, the work begins.
"We acknowledge there is a lot of work for us to do, but we also stand by our promise that we will deliver."
BBC Sport - Football - Russia & Qatar will host the 2018 and 2022 World Cups
Thank you Qatar for reminding us that dreams do come true. I remember my many visits to Doha and watching in disbelief the ads for hosting the World Cup. I thought they were dreaming.. and they were.. only that they dared to make it true. I hope the rest of the region catches some of the inspiration and dare to change for better. It does not have to be big dreams.. little change can make big difference.