Each tile describes an aspect of Social Contract Theory. Drag each idea to the portion of the Declaration of Independence which illustrates it.

If i remember correctly it was caused by people hurling bodies at a country for some reason and them they all became infected

Cis the answer your looking for

Bit late for the op, but for those coming here later the answer seems to be "it enabled families to remain in close contact even as they moved across the country and across the world."