I am opposed to the existence of states and the U.S.'s interpretation of federalism for a number of reasons and I also reject their arguments for existence. So I will talk about them below.
[*] The existence of a state as envisioned by the U.S. Constitution is distinctly outmoded thinking. The very fact of Texas's admission (which came after the French Revolution) should be a big red flag that the idea was shopworn in the mid 19th century, let alone today. Of course, something being old isn't a reason to get rid of it, but I am just kneecapping anyone ahead of time who wishes to argue this on a basis of authority or that stupid Founding Fathers' wisdom crap.
[*] People say that the existence of states protect against the 'tyranny of the majority' (that is, large numbers of people forming factions and voting against the interests of some minority). Steve Kangas wrote a response so well to this that I am just going to spoiler it.
The long answer is that viewing democracy as a "majority" and a "minority" is a bit of false dichotomy. Democracies have two inherent safeguards: first, everyone has the vote, which means that everyone exerts influence. Second, everyone belongs to minorities based on age, race, sex, special interests, religion, etc. Democracies need coalitions of minorities to form majorities, and the horse-trading that goes on is one of the best defenses against the tyranny of the majority. We can see the relative success of this system in the vastly different treatments that democracies and non-democracies reserve for their minorities. Non-democracies have a long and bloody history of minority genocide, like Nazi Germany slaughtering the Jews, or Turkey slaughtering Armenians. By comparison, democracies treat their minorities significantly better.
Critics then point out that democracies do not have perfect histories, either. The U.S. had slavery, for example. But here it’s crucial to note that America has evolved from a weak to strong democracy. The U.S. inherited slavery from a completely non-democratic institution, the British monarchy. And, as noted above, the U.S. began not as a true democracy, but as an aristocracy of land-owning white males. As various minorities won the right to vote, their greater influence considerably reduced their oppression. This gave rise to the common observation that "the problems of democracy are solved by greater democracy." In a strong democracy, any pro-slavery movement that swept through the white male population would be crushed at the polls, not only by the votes of blacks, but by every other minority who saw their rights threatened next. For this reason, strong democracies have greatly reduced the oppression of minorities.
In a democracy, the majority's wishes are often ameliorated to accommodate the minority's wishes. One could say the "tyranny of the majority" is counterbalanced by the "tyranny of the minority." This system, based on agreeable compromise, is the optimal way to minimize coercion.
And that's why the whole existence of states protecting of 'tyranny of the majority' is bullshit. For one, it's still theoretically possible for this to happen, since state boundaries are not drawn along populational lines. If the 30 most populous states designed to pick on the other 20 then the state setup is no defense at all. For two, the setup also allows the 30 least populous states to pick on the other 20, which is even more heinous. Not only do you have the same situation of a faction of states raiding another, but you're also maximizing the number of people hurt by this setup. That's what I meant by 'tyranny of the minority'?
Now the question is, how much does the United States engage in Tyranny of the Minority? Quite a bit, honestly. Not enough to cause open revolt, as one person stealing a quarter from four million people is less noticable than four million people stealing a quarter each from one person, but it's quite a lot. You only need to look at state unemployment figures and pork amounts. Disregarding the South, small states have lower unemployment and more federal money than larger ones. Which is a nice segway into the next problem.
[*] The very existence of states encourages factionalism. You can see the Eurozone right now for an example of this, but if you want something more in the vein of American Exceptionalism you can see California and Texas. Rick Perry is famous if that's the word for initiating a jobs program that directly sapped the jobs from California. Yet he will get away with this because few people in Texas -- who control the purse strings and his office -- are able to care. Hell, they might actually encourage sticking it to the West Coast liberals.
For more information on this, see You Are Not So Smart.com's article on Asymmetric Insight. People really do form bullshit disputes and factions not based on anything rational but just because there's a different group available. Indeed, even if it didn't entail additional organization just the existence of organizing people into factions entails a base, unavoidable harm. So the mere existence of a subgroup needs to have an additional justification in order to accept it. Shit is not free. So when pressed on this point, people mostly hem and haw something about state culture.
[*] Even if you believe that state culture is a sacred entity that must be preserved, can you please tell me why in the process of preserving state culture it needs to be accompanied by political power? Hell, can you even tell me what state culture is? I mean, the distinction of a state is a totally arbitrary entity. Can anyone not from either of the states tell me the difference between a Montanan and a North Dakotan resident? How about Virginia and South Carolina? And even when the difference is potentially profound like California vs. Mississippi, is it really all that much? I mean, both places have the same basic history starting in the 20th century, let alone 21st century. Even so, the fact remains that state culture changes over the timeframe of the country. The panhandle of Texas and Oklahoma have much more in common politically and economically than South Texas but redrawing the state lines to reflect this is almost politically impossible.
[*] The next generation does not give a shit about your stupid state boundaries and whatnot. Yes, even after the United States Constitution was drafted, it probably wasn't very hard to find citizens who were still resentful of this government change and though of themselves in private as British subjects. Some people converted, some people probably went to their grave jerking off to portraits of George the III and Sandwich. Regardless, the new country was drawn up with or without their consent. Do you think that their grandchildren gave a toss? Except for a handful of completely hopeless cases, no. Great Britain still didn't have freedom of religion and still had a relatively powerful House of Lords and monarchy so chances are they would prefer this new system more. When a child is born, they're not born attached to bullshit symbols like the football mascot and the state anthem and the state flag and all that shit. They're attached to what they grew up with, which if the parents were born in Texas but moved to Arkansas will be that.
But you know what your descendents will notice and care about across generations? The lack of a fair distribution of political power. Oh, sure, you can distract people from this by telling them that their arbitrary identity as a New Yorkian depends on their ceding some political power to some asshat in New Hampshire, but it's not something that can be justified on its own. You don't have to justify why the bluebonnet is the best flower and Texas is the awesomeness, but you do need to justify why 1/10th of your tax dollars is being pissed away propping up a state that's richer than yours.
[*] People say that we 'need' a Senate in order to increase the time for debate and prevent ill-considered legislation from sweeping through the public.
Disregarding that this same mechanism is also what causes 'good' legislation to wither up and die on the vine and also disregarding that the Senate has and will hastily approve ill-considered legislation anyway thus abdicating this dubious function, there's absolutely no reason for states (or more specifically, the U.S. Senate) to exist in this fashion. If a cooling off period is what's necessary for wise legislation, then you should either increase the time necessary for debate for non-emergencies or at an absolute minimum the 'cooling off' body should also ultimately derive its power from the people.
[*] The very existence of states hurts transparency of government. One of their arguments is that states are 'closer' to the people than the federal government but as least since WW2 this is very clearly not the case. A 'closeness' argument is just plain goddamn laughable. More people know the President than their governor. More people know their Congressional senator than their State senator. More people know their Congressional Rep than their state rep. Hell, more people know who the fuck the Secretary of Defense is than their states' Attorney General.
Here is some insight as to why this is the case. As I said in the last thread, I am a resident of Austin, TX. And I have a lot of people who I can vote for and elect director. Leaving out positions like dogcatcher or Lt. Governor (I know, I know) in roughly descending order of individual power I can vote for: 1 President, 2 Congressional Senators, 1 Governor, 1 Congressional Representative, an unknown number of state supreme court justices (Texas uses a hybrid of election and appointments), 1 State Senator, 1 State Representative, and 1 Mayor. Actually since Austin exists in more than one county and I live right on the edge of a Congressional district, I should ideally know more than I do.
But you know what? That's already too goddamn many people to know and keep track of. And I consider myself relatively well-informed compared to the public at large. Voting statistics reflect that; only like a fifth of the people even vote for their State Rep. And going back to my previous point, the reason why more people know the President than their Governor is because when there's just too much information to keep track of people just end up paying attention to what they perceive as important and then skimming the rest.
The entire state setup encourages that. That's why I originally proposed a bicameral legislature wherein the upper house was strictly assigned by party elections (I also support proportional representation, term limits just for this chamber, and eliminating 'first past the post' for this chamber, but that's another story) and you didn't particularly need to know the individual members. I mean, it's helpful to know who is the Majority leader and which individual leads committee assignments, but it's not necessary. You are voting for a party, not for a person. The lower house works pretty much like it does now, but with the elimination of states the Congressional representative has a bit more power (since they will control their intra-district affairs more stringently but since the central government has a lot more power concentration it's a wash) and much more visibility. For cities that are too large to fit in a Congressional district, such as New York City, the cities will have specific powers invested in them and will elect a mayor which will probably have a different title to avoid confusion. But for most rural and suburban areas, the mayor is still the mostly weak and deck-chair rearranging office that it is now.
Now, even if you reject my proposal, you still need to tell me how you manage the fix the problems of visibility and accountability! And if you don't think it's a problem, tell me why.