Answer:
States gained a large piece of western land know as the Mexican session cession.
In Poland, the movement against communism was led by Gorbachev
Well there are two ways of really explaining this, but "The Common Good" by definition is something that benefits or interests of everyone.
The political term, is literally the same thing; "What is shared and beneficial for most members of a given community"
Hope this is the answer you are searching for.
