It was a kind of social protest - people did not want to be discriminated because of their race or sex. This event was a precedence - nobody thought that something like this protest could occur at that time. Rosa Parks did something that made people think about tolerance and also made other people join her protest in different places.
A turning point usually introduces new people, ideas, and technology which results in different forms of government change in idea and even rebellions. So it can be thought of as a revolution because new things are showing up and change is happening.
90% is the percent of Jews.
Because there was either less supplies or more supplies where there was trade.