Define glasnost and how did it contribute to the soviet union breaking up?

Glasnost means openness.  It was a relaxing of government regulations in the USSR in the late 1980s.  As people in the USSR got a taste of freedom, they wanted more, and the Soviet Union ultimately collapsed (in 1991).

Context/detail:

In March 1985, Mikhail Gorbachev proposed policies of perestroika (restructuring) and glasnost (openness) in the Soviet Union.  These seemed like policies that leaned in the direction of Western ways of economics and politics.  Perestroika meant allowing some measure of private enterprise in the Soviet Union.  Glasnost meant allowing a bit of freedom in regard to speech and publication.   But don't get the idea that Gorbachev was trying to get rid of the Soviet communist system.  He actually was trying to prop it up and preserve it, because it was starting to have many problems sustaining itself.  But in the end, opening things up a bit with perestroika and glasnost policies only pushed the USSR further in the direction of shedding the communist model under which it had lived for so long.

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explanation:

max weber's 3 types of authority. the sociologist and philosopher  max weber  distinguishes  three types of authority—charismatic,  traditional  and legal-rational—each of which corresponds to a brand of  leadership that is operative in contemporary society.