Quote Originally Posted by Bramicus
You need to do your homework. The United States contributed $438 million to the United Nations' 2005 budget of more than $1.8 billion, making it the largest donor.
Speaking of doing your homework: paying the assessed contribution of 2005 (if the US actually already did so, don't know) does not relieve the debt from past years. If my info is correct, the US still owes the UN some 1.55 billion $ for the regular budget, peace-keeping operations & tribunals.

The US is paying (when they actually pay once in a while) the lion's share, because they have the biggest GNP. Actually, for quite a while they paid less than they would have had to acc. to the contribution key, because the US budget was over the ceiling of 25% of the combined GNPs of the world (could you call that "world GDP"?).