It helped people move and transport goods to other places
Humans must have external constraints in order to live together
A. 30,000 units because the total energy decreases
Answer:The following were potential sources of power for the United States industries: coal fields, oil deposits, and rivers and streams. ... Trains used to work using coal. (Oil deposits) <your answer)are abundant in some parts of the US territory and petroleum represented a new source of energy that made industries more efficient.
Answer:
1989 when the Berlin Wall came down. The Soviet Union dissolved in 1991.
Explanation: This is a world history questions. These two events led to the breakup of the Soviet Union.
