Railroads played an absolutely crucial role in the Industrial Revolution, since they made for the incredibly fast transfer of goods such as iron and steel that were used to build things--not to mention the transport of the workers themselves.
Containment was a policy that used many strategies to prevent the spread of communism abroad. The reason such a policy was introduced was in response to a series of moves by the Soviet Union to enlarge its communist influence in countries like China, Korea, and Vietnam.
Answer:
Storming of the Bastille, Abolition of feudal (noble, clerical) rights, Declaration of the Rights of Man, The Wives' March; Louis “kidnapped” back to Paris were the main events and Cause=American Revolution, Social inequalities between the estates, economic problems, government debt Effects=abolishing monarchy, it lead to the Napoleonic era because of the turmoil in France Napoleon was able to rise to power quickly and win many battles for his county.
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Pope Urban II calls the first crusade - this event was caused as Byzantine Emperor Alexius I made an appeal to Urban for assistance. Urban united Christian Europe to fight against the Turks to take back the Holy Land.
Urban degraded Muslims in speeches with exaggerating stories of anti-Christian acts, giving the united Christian Europe a common enemy and a promised reward.
The Christians were, however, initially beaten back due to inexperience and lack of discipline.
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One of the most important was climate changes. As climate changed, nomads had to find new places to migrate to which led to people going to areas that were uninhabited before. Another was the development of agriculture which more or less ended the nomadic way of life when people started settling.