In our time, a very close cooperation is beginning to form between countries. For example, there is a common market. Despite great disagreements between nations, the agreement must be reached because they are exceedingly interdependent. This is why borders disappear naturally. Now, even though there are political borders, there are no longer economic borders. The whole world depends on the stock markets in Tokyo, Shanghai, New York, and Tel-Aviv. Everyone depends on everyone. There is also an additional dependency due to ecology, etc.: we do not even imagine the extent to which everything is interconnected.