America has copied many of Hitlers actions since the Great Depression of the twenties and thirties. What is now known as the Peace Corp was an organisation established in late twenties USA, where teenagers were used as a patriotic workforce which planted trees around the dustbowl, to stop soil erosion. Likewise, the Hitler Youth were used in community programmes.
Under Goebbels propaganda, Hitler evoked the Wagnerian approach to German mythology, arousing the 'Siegfried' in Northern German society to fight for Germany. Likewise, President Bush uses the term 'patriot' as a recruitment banner. Whether it is the 'Patriot Act' or claiming (as Sarah Palin did) that non-Republican Virginians were 'unpatriotic'.
Hitler scapegoated a non-Christian religion, turning German resentment upon the Jews, just as President Bush and Gordon Brown are scapegoating Islam, just because a minority use terrorism.
Germany was not facing depression as stated by the answer above; Germany was starving, life was cheap and it had been reduced from a major power into the equivalent of present day Rwanda or Congo. This was due to the retribution for the first world war, and because of the extreme punishments dolled out by the 1919 Treaty of Versailles, ending WW1.
Yes, when problems arise people tend towards the extremes of politics, such as the BNP in the UK. However, a fourth reich occuring? - no. This depression has been caused by the unfettered Capitalist approach to banking, so more people will turn to the left of politics - eg USA elects a Democrat not a Republican, the UK where 'New Labour' is unpopular and people wishing for the old Labour party of the left, not a copy of Thatcherite Conservatism.