According to sociologist max weber's classic definition, class refers to social ranking of people who share

   Social-economic conditions

Explanation:  Classes, according to Weber, mean the subdivision of people into groups or social categories according to their economic power and social status. This means that all members of one class share the same opportunity to acquire a certain amount of money and wealth, as well as a certain influence on the basis of which they could acquire that wealth. These opportunities and influences determine the status, privileges, honors, and all this again determines the position in the market, where it actually determines which class someone will belong to. So there are lower, middle, upper classes. Weber was of the opinion that being born in a particular class generally determines belonging to a class, because it is difficult if someone born in a lower class becomes a member of the middle class and the like. More specifically, one who is born in the upper class has the greatest chance of being rich.

because this was the year that the state of israel was formed

because the early people found out about it.