I have seen the arguments many times; Bush is Hitler, the USA is a Fascist state, the Republicans are Nazis.
I have yet to see any intellectually honest assertion of those sorts that is able to stand up to even the lightest of scrutiny.
In most cases terms are misused.
Many people who accuse America or Americans of following in the footsteps of Mussolini like to somehow equate "Capitalism" with America and then equate Capitalism with "fascism".
America is not a Capitalist nation. The term "Capitalism" was first coined by Marx to describe the functions of the mercantilist Imperial systems of Germany and France. While he is right that mercantilism as practiced at the time was antithetical to liberty and equality the use of the term today is nearly farcical. Today it is little more than a straw-man, an exageration that is easily refutable.
The US is a more-or-less Laissez-faire economic system/government system. A Free-market better describes the USA rather than the term Capitalist does.
A: Free-Market: Business governed by the laws of supply and demand, not restrained by government interference, regulation or subsidy.
Marx, much like his contemporaries ( Excluding the followers of Adam Smith and John Locke) made the mistake of assuming that Mercantilism was the final state in economic evolution. Marx's theories on labour and value are largely derived from the mistaken assumption of Mercantilism-as-good-economic-policy.
Fascism makes this same mistaken assumption. Rather than devolving all relationship towards property to a world-wide community Mussolini and Hitler sought to harness business to an ethnic or national desire and benefit.
The USA, on the other hand , did away with the mercantilist assumptions upon its birth as a nation and has rarely revisited them since.
Economically the USA is nothing like a Fascist State (for that matter neither was Pinochet's Chile).
Another Common accusation I see is that the USA tries to supress public speech that runs contrary to the Status Quo. This might SEEM to be true in a few circumstances but since it is not applied from the top down, nor in a regular fashion I fail to see any connection to the Fascist Suppression of freedom of expression. Combine this with the seeming inability of those who violate the speech rights on behalf of the govenemnt to get away with such suppression without repurcussion striesk me as good evidence that no such fascistic tendency exists on behalf of the USA government.
If Noam Chomsky can get away with a quarter of a century of vitriolic criticism of the USA and its government then I must assume that the Government habours no fascistic tendencies.
I think the primary problem most peoplehave is defining a totalitarain or dictatorial regime. Most people assume any such regime must be A: Fascist or B: Communist. I must say that the history of the 20th century lends credence to these assumptions. But one must ask if the national character of the USA lends itself to tyranny. I should think not. Furthermore if the US government did, indeed, sink to the level of a totalitarian regime what form of familiar tyrannies would the USA assume?
Theocracy? Fascism? Populism? Communism? Plutocracy? or some other as yet unknown form?
I do not think any of the above or any form of dictatorial regime would sit well with the populace as evidenced by our constantly changing political landscape. The Citizens of the USA have long grown comfortable with the freedom afforded to them by their form of governance and to accuse them of being lead by "Hitler" is a slap in the face of every voting member of the electorate.