Globalization or Nationalism?

In antiquity, the known world was globalized. The entire Mediterranean region, all civilizations (Cities-State) marketed. Globalization creates interdependence between countries, generates employment and helps nations in their development. This is important because it unites the nations and avoids wars. The only problem of globalization is the widening of the gap between rich and poor. Who should resolve this are the governments, raising the tax only on the rich, France is an example. Globalization or nationalism? It must reconcile the two. Globalization is without a return. The two can walk together.