Limiting western settlement provided several advantages for Britain. It allowed theBritish government to control westward movement and to avoid conflict with Native Americans. Also, keeping colonists near the East Coast ensured a market for British<span>goods in the coastal cities, where trade flourished.</span>
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If this is on The Fall of the Roman Empire
I think it would be the diversification of races and culture that the United States have today. Immigration have changed and shifted United States in politics, economics, social and culture that enables the US to be what it is today. Diversification plays a significant role in the US because it shifted the policies of the country and it makes the country more flexible and achieve a level of prosperity and progress in all aspects.
The best way to collect oral history is by listening and repetition is how you maintain oral history i hope i helped you