Here is your answer hope it helps:)
<h3>Because of Douglas's political stature, the campaign attracted national attention. Its outcome, it was thought, would determine the ability of the Democratic party to maintain unity in the face of the divisive sectional and slavery issues, and some were convinced it would determine the viability of the Union itself.</h3>
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The correct answer is - rugged mountains and hills made inland contact difficult.
While this answer may be surprising it is nevertheless true. At the time, there were no modern ways of transport. Moving from one location to another greatly depended on how passable a terrain was. Since the terrain between Greek city-states was very difficult to pass, maintaining autonomy and the sense of belonging only to the city was strong instead of belonging to the country.
The answer is: The Deleware River
