Central america is a(n) that connects the continents of north and south america.

Central America is a long and narrow strip of land which is located between two bodies of  water and which connects two pieces of land - we call such a formation an "isthmus" - this is the correct answer. 

The Suez canal is also such an isthmus and so is Manila, the capital of the Philippines.

Master planned communities outside of chicago. note: population density means people living in an area per square mile. chicago, an urban and highly populated area has a much more higher density than a desert, amish community, settlement, or nomadic region.