Seems like it may be an incomplete comparison as it underweights/excludes private contributions though it's difficult to tell.  I suspect once you add remittances + private charitable contributions, you would see the US punch significantly higher than even its current outlier position.<p>Private contributions almost certainly bias towards the US where when it comes to foreign aid/charities, the majority comes from private individuals versus almost every other country where the bulk of funds go through official government aid channels.<p>I have to also imagine that this doesn't include the contributions through the US military (which Michael Moore's site has also cited in its ability to provide enough water purification to a mid sized city through the air craft carrier now stationed there) which cannot be cheap.