Answer:
Belgium, France, Germany, USA
Explanation:
https://www.history.com/topics/industrial-revolution/industrial-revolution
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Geography, including regional differences in soils, rainfall, and growing seasons was the primary cause of economic differences among the colonies in North America. A result of the encounter between Europeans and Native Americans was that new diseases were spread to Native American populations.
The main factor that influenced African Americans to migrate from the South to Northern cities was that they were looking for better economic opportunities.
The Great Migration, also known as the Great Northward Migration in the 20th century, happened because most black people were badly treated by many people that still expected African Americans to be slaves, and their economic conditions were quite poor.
As a result, African Americans decided to migrate to the Northern cities, where they would get many job opportunities as well as going to have a better lifestyle by not being discriminated.
The correct answer is <span>Invasion of Cambodia
Although the war had been localized to Vietnam, in 1970 the Southern Vietnamese army with the help of the United States troops had invaded into Cambodia who was also having the same problems as the Vietnamese, the communists were fighting those against communism, so Vietnamese people decided to join the fight, which stirred a new round of protests.</span>