How did cities address the problems caused by urban living?

a. governments began to offer services such as mass transit and sanitation.
b. technological innovations improved crowding.
c. city planners increased land dedicated to public use.
d. residents organized neighborhood watch programs.

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jefferson hoped to establish trade with the native american people of the west and find a water route to the pacific. jefferson also was fascinated by the prospect of what could be learned about the geography of the west, the lives and languages of the native americans, the plants and animals, the soil, the rocks, the weather, and how they differed from those in the east.