Oh...gods...I have the sudden urge to bang my head on the nearest wall all of a sudden.
Wars: You forgot to mention War of Independence (possibly justified), 1812 (unjustified), the punitive expeditions against the Barbary Pirates (justified), the Mexican-American War (completely unjustified), and a little thing called the American Civil War (justified). A lot of those happened well before Woodrow Wilson, and besides that, whatever other sins I've heard him accused of (racism, unbridled idealism), I do not believe I've heard him accused of empire-building. Heck, his ideas formed the basis for the League of Nations (absolutely hated by isolationists and American hegemonists) and he tried to ensure self-sovereignity for the ethnic groups of Central and Eastern Europe, and he managed to avoid entering WW1 for three years until Germany tried to gain Mexican support for war with America and declared unrestricted submarine warfare.
Something occurs to me, though, with the reason you gave for WW2 being justified. If Hitler had not declared war on America concurrently with Japan, would WW2's European front have still been justified? For that matter, Japan largely declared war on America because of the oil embargo that was choking them and interfering with their own foreign policies (i.e. beat up China).
Ideology: Whatever you may say, neo-conservatives are still conservatives. Reactionary conservatives, but conservatives nonetheless. I also disagree with your take on a couple of the people you listed, and I certainly disagree that there's a conspiracy to seize the reins of global power. Of course, I suppose it depends on whether you mean economic laissez-faire conservatives or social conservatives, considering the Republican Party combines the two. Most of what you want is economic conservatism, while neo-conservatives are largely social. Meh, whatever, it doesn't change that either of the two is just as real as the other.
Gold Standard: To quote Keynes, "Money doesn't matter." Quite literally no nation uses the gold or silver standards anymore. The major Keynesian arguments against it are that deflationary forces caused by a fixed standard reduces economic fluidity and intensifies recession. Most economists realize just how problematic the gold standard was, and aside from a handful, most who study the situation do not want something like it to happen. On top of the reasons that gold standards can be a bad idea, there's the expense and difficulty of transition. Gold prices are high, right now, and that makes it very difficult to set the backing. Besides which, a lot of currency would have to be taken out of circulation, which will boost the value of the currency left to compensate, lead to serious deflation, and...bankruptcy of a lot of companies that depend on the dollar to purchase their goods.
The American "welfare state": I'm sorry, but this just made me laugh. That is all.