This is a bit subjective, but it could be argued that social change had the biggest change in Southern life, since the abolition os slavery (which was inherently a social issue) led to the biggest changes.
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The Russian term glasnost refers policies that are generally "transparent"--meaning that the general public can "see" into the workings of government. Perestroika had to do more with "reconstructing" Russian policies to fit a more modern world.
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