The Roman government had a republic and some of there principles like electing a leader its still used in the American government today.
Answer:
Country A: Stage 2 with a high birth rate and a youthful population and is a developing country.
Country B: Stage 4 with a low birth rate and low death rate with an aging population. It is a developed country and there is a possible Stage 5.
Explanation:
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Convergent oceanic continental