>Somebody helped to create this unbelievable American system that we have that allowed you to thrive. Somebody invested in roads and bridges. If you've got a business — you didn't build that. Somebody else made that happen. The Internet didn't get invented on its own. Government research created the Internet so that all the companies could make money off the Internet. The point is, is that when we succeed, we succeed because of our individual initiative but also because we do things together.
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>If he were talking about the roads and bridges, he would have said "You didn't build those"

So, his writers are no grammarians, what else is new?