What three political questions or topics best explain the political transformation of the United States from 1970 to today?

What three political questions or topics best explain the political transformation of the United States from 1970 to today? Or, put otherwise, what were the three biggest sources of disagreement and debate that shaped politics in America from 1970 to today?

Felon disenfranchisement should be put to rest no matter the severity or repeated offenses in the state of florida

argument is that felons should be granted the right to vote no matter the severity of criminal charge. I believe that felons should still have a voice in the society as they will be treated differently by some, ridiculed, and judged and voting will give them a voice again. Voting allows the felons gain responsibility and rebuild their reputations by a good start of paying their respects to society and attempting to help shape the world. It’s their way of giving back to society after having made a poor decision in life. As for repeated offenders I do agree that their timed sentenced should be more harsh, but in some sense still doesn’t justify why voting rights should be snatched away. The political officials have been accused of all sorts of wrong doings, yet they remain in office.