I'm so tired of this myth that Americans donated the most. In total, yes, because it's a huge country. But on a per capita basis, which is more important, America is number 18. Number 18!!! That means that 17 countries have donated more per capita. And this in spite of the fact that America is the world's richest country.
http://en.wikipedia.org/wiki/Donations_for...er_capita_basis
Of course we (Europe, Asia, Australia, ... whoever) should still donate to the USA. If they accept our help, that is.