I wanna say the answer is d
Answer:
The Collapse of the Soviet Union. ... Gorbachev's decision to loosen the Soviet yoke on the countries of Eastern Europe created an independent, democratic momentum that led to the collapse of the Berlin Wall in November 1989, and then the overthrow of Communist rule throughout Eastern Europe.
Explanation:
Heat causes chemical reaction so that might be a way in which people use chemical properties to separate one substance from another substance .
Answer:
Explanation:
Geographic and economic factors that influenced westward movement
Population growth in the eastern states.
Availability of cheap, fertile land.
Economic opportunity, e.g., gold (California Gold Rush), logging, farming, freedom (for runaway slaves)
