> The United States won't even sign on to the UN Declaration of the Rights of the Child which would give them the right to food, education, healthcare, etc.

There are a vast majority of us that believe that our governments should be guaranteeing primarily negative rights - that the powers we grant government must not take certain actions. We believe positive rights are incredible dangerous and ought to be reserved for only those truly special cases where universal collective action is truly required like mutual self defense.

The wonderful thing about positive rights like the one you propose here is that you dont need to wait for government to act. You can start donating yourself right now! No need to force everyone else.