Should all states be abolished? (i.e. end our federal system of government?)
I see three big reasons for rewriting our Constitution to end the notion of separate states:
1- That somebody could be treated vastly differently, depending on which state you happen to reside in, particularly in regard to criminal codes and voting rights/power, seems quite contrary to justice.
2- Our current system makes it more difficult to respond to national emergencies. Obvious case in point: this covid pandemic, where a country like South Korea could enact nationwide mandates without the interference of state governments.
3- Our system makes economic progress more difficult. Cases in point: giant water systems in China, modern high speed rail systems in Japan, ultra modern and vast construction projects in Dubai, Taiwan, Qatar, etc. (in this latest point our system of capitalism also is a major hindrance).
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only a small percentage of residents would agree. Even most of the liberals who approve requiring state and local governments to basic standards set by our liberalism-based constitution wouldn't want that.
Of course centralized governments have some advantages, but also disadvantages. Both Russia and China are prone to odd famines and other little problems of mismanagement here and there. Their censored news can't keep all problems from being known. And, of course, there'd only be the presidency and central committee for a totalitarian fascist or oligarchical cabal to get control of. Not that that ever happens, of course, but speaking theoretically... 
