The map shows the Roman Empire. A map titled Boundaries of the Roman Empire. A key shows areas of the Roman Empire during 2 time periods. Roman Empire in 201 B C E are green, Roman Empire additions in 100 B C E are purple. How would a historian use this political map to study Roman civilization? to understand Roman forms of government to determine how the Roman Empire expanded over time to determine how much wealth the Roman Empire had to understand how geography affected Roman culture