How do you read population pyramids in world geography?

How have ethnic groups shaped the population in central america and the caribbean? how has migration shaped the population in central america and the caribbean? how has small land areas shaped population in central america and the caribbean? how has a rapid population growth shaped the population in central america and the caribbean?

The creation of the european union has had all of the following effects except

After railroads, the next revolution of transportation came with the development of (a) automobile (b) telegraph (c) steam engine