Westward expansion meant that the US acquired ever increasing amounts of land, and needed people, farmers, to settle there so it could maintained without a huge military presence
Investigate past climate and atmospheric changes
The economic system may be production,allocation,distribution,firms,and how the government responds to the economic problem.
Answer:
ooh yeh the river tees walls forms a barrage that divides the tees estuary and the catchment from the upstream, this helps stabilaze water levels for amenity purpose. so it you ask me how its been managed then:
the humans where the one to bring up the idea of
putting the barrage in there
