Answer:
Depends
Explanation:
Depends on which time they immigrated. If it was during the depression or war then definetly not, and the 20th century had plenty of political unrest in America (WW2, Vietnam, etc) so an argument could be made that they did not achieve the American Dream, but on the other hand it depends on who it was and where they were from compared to America.
I think it would be police officers
The breakup of the Soviet Union in 1991 may be most directly linked to the 20th-c. process of fragmentation.
