Why did the Romans want an Empire?

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Across
  1. 4. — Famous arena in Rome where gladiators fought
  2. 5. — Roman province that later became modern-day France
  3. 6. — The control of many countries by one government or ruler
  4. 7. — The process of taking over land and people by force
  5. 9. — Rome’s province on a large island north of Gaul
Down
  1. 1. — Another word for “friendships” or agreements between countries
  2. 2. — People captured in war and forced to work
  3. 3. — Roman province in the Middle East where Jerusalem is located
  4. 4. — People living under Roman control who could be given special legal status
  5. 8. — The trading of goods between different regions