The first political geographer who studied the state in detail was friedrich ratzel who postulated that the state resembles a biological organism. his organic theory identified as a state's essential life giving force.

Space.

Explanation:

The German geographer knows as the Ratzel gave the spatial division of the labor that follows the growth of the organism and its growth centers the organism and it spread through the pace and thus he regarded it as the resembles to the biological organisms. Hence his organic theory considers all the living organisms as they seek all the nourishment from the food to survive and can be evident for the theories of the Heartland and Rimland under the geopolitics.

Cultural convergence is the theory that two cultures will be more and more like each other a very notable example of this is around the u.s.-mexico border, where 

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