They faces serious attacks by the indians and sometimes from disease that spread from person to person and sometimes killed whole settlements.
There were also accidents and the fear from drowning in the river.
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Answer: Population momentum
Explanation:
Population momentum is the representation of the growth rate that shows growth of population even if the factors such children born by women, fertility rate,reproduction is effected and reduced.
This rate tends to increase due to present scenario of childbearing population range of people. Population momentum can be extracted from population age structure.
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