It may sound like a sacrilege, but the world's anger and resentment of the United States goes back farther than George Bush and the Republican regime. Anyone remember Somalia? Kuwait? Bosnia? How about Granada, El Salvadore, or Chile? Anyone remember a place called Vietnam? Anytime the US has intervened with our military, particularly without UN endorsement, it has brought down a storm of criticism. In Vietnam, our soldiers burned villages and threw prisoners out of helicopters.
I am no fan of George Bush, but to uncover the sorces of resentment against America, I believe you have to look deeper than the actions of the current administration. Kennedy, Johnson, Bush Sr, Clinton all took their lumps for unilateral military actions.
I believe the reasons for resentment lie primarily in these areas :
A) At one time, the United States was the only country on earth to create itself in the image of a republic ruled by its own people. This while the rest of the world was ruled by monarchies and dictatorship. As such, the US became the model for the common man's struggle against oppressive rule, and it's success gave direct impetus to the overthrow of Kings and dictators all over the world. This dissemination has taken root, and most countries on Earth now enjoy at least some level of democratic self-rule, and the idea is no longer strongly associated with the US.
B) During the Cold War and the many hot wars within it, the US was perceived by most as the defender of Europe and the West against the power of the USSR and China, and as such, a certain amount of slack was cut for Anmerica in the interest of protecting freedom and democracy. With the fall of the Soviets, the power of the US has seemed less necessary to Europeans, and the US's ability to act unilaterally, due to the lack of a formidable opponent, is both resented and feared.
C)American Culture with its films, music, fast food restaurants, and consumerism, like it or not, has become the dominating cultural paradigm on Earth. This is resented in many areas where the native culture is being seen to be overwhelmed, but paricularly in Islamic States, where the feel-good trappings of American Culture run counter to the puritanical nature of the Islamic belief system, and where commonly accepted freedoms such as the freedom of expression and women's rights are often viewed as dangerous and irreligious.

The US is, and continues to be, a country ruled by the will of its people. It is a country born with a glorious vision that I believe we still strive toward, and have at times attained. The fact is that the majority of its people supported the incursion into Iraq. The majority of its people voted to elect a Republican majority in its Senate and Congress, and to elect a Republican president. The people's power will again be expressed in the mid-term elections, and I hope that the Democrats will regain a majority. This may have an impact on the immediate situation in Iraq, but I believe it will have no impact whatsoever on the factors I have noted above.