If we’re talking history here it might be the Brown vs.
Board of Education of Topeka where the court ruled that segregation in public
schools was unconstitutional. This was
because of the inequality of facilities in Black schools compared to White
schools. This would pave the way to
integration of schools in the U.S.
Islam regulates, apart from beliefs, also everyday life and customs. For example, it restricts what you can eat (halal) and effectively ensures that you will most likely eat with fellow Muslims (you're unlikely to eat non-halal food with non-believers).
It also regulates your day, requiring you to pray five times a day - this has a big influence on people's everyday life.
The soviet union surprising launch of sputnik.