What impact did this innovation have on daily life?

Explanation:

It increased the regional differences among various groups of people across the country. It became a major method of long-distance communication for many years. It allowed people to sign legal documents from across the country.

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interdependence is when all participating groups and individuals depend on each other. if you depend on one anothers goods, you end up trading in order to get the items you're looking for. (for ex: if i have food and you have water, we trade in order to depend on each other to live)