What was the first "intervening obstacle" which hindered american settlement of the interior continent?

the phenomenon that would be cited as evidence of increased economic interdependence between europe and the americas is  the development of mercantilism.

this theory suggests that the wealth of a country depends on its economic assets, or capital.

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equal area projections

equal-area projection. a projection in which regions on the earth's surface that are of equal area are represented as equal.

they were all fought in the middle east during ww1

spread of christianity