The floods of the Nile provided rich, black soil so the people's crops could grow easily.
As a general rule a Coast becomes the center of trade as ports are built & ships (with merchandise) sail form here. Hinterland areas are served too. Hence there is always interaction with people across the globe of diverse culture, languages, ethnicities.
The International Monetary Fund encourages economic development following the fact that it’s an agency that helps to promote economic cooperation. This is following the maintaining an orderly system of world trade and exchange rates
A Neolithic city is established at Catalhoyuk in central Anatolia, the world's first known settlement.
I do believe the answer to this question is both Egypt and Mesopotamia.
