Shreck, the Marshall plan was aid not a loan althought the Germans had to pay it back. Nor was it simply charity. It wasn't in America's interest to have an impoverished unstable Europe, politically and economically. The US came out the war richer and more powerful than it went in and it dominated the world's economy for a long time afterwards and helped make it the country it is today. The Marshall plan was in the USA's best interests too. So perhaps you are crossing the boundary.
In case you want to mention Lend-Lease. The British made their final payment back in 2006, not sure about other countries.