Well, yes and no. Most of the Marshall plan got "american" money, but not necessarily taxpayer money. And you did quite well in ensuring the EU (and specially the Germans) would not compete with you in the following decades - that's how you got the golden years of American industry - by financing out the competition. Best cars, best medicine, best computers, best everything. Meanwhile, everyone caught up. Now even Cuba is a better choice than an average USA hospital, cities like Detroit lose to Japan and Germany, and even in tech - the last remaining American bastion - loses ground everyday. If you ever studied the rise and fall of the roman empire, you can easily see the comparison. Don't pat yourself in the back just yet.