Currents of internal migration.. some people characterize the movement, strong and non-lasting stability, such as the Slavic peoples. Contrast natural and economic regions of America, which separated by political borders hinder immigration

Currents of internal migration:

- No country only saw the internal population movement, but to varying degrees, and is characterized by some powerful people and not the movement, lasting stability, such as the Slavic peoples, and it seems the impact of these, especially in the republics of the Soviet Union and clear peoples.

- The United States is one of the largest countries in the world in the internal movement of the population, and it is estimated that one in five people traveling between its midst every year because of the breadth and magnitude of the state, and the variability of natural and economic territories separated by political borders hinder migration.