As I mentioned, there was no need to answer the question. But since you brought it up...
Maybe because America has only been involved in spreading freedom around the world, not dominating the world in some destructive way.
I can only highlight so much in that quote above. In essence, you just answered the wrong question. Now the question is -- Do I begin to start listing unconstitutional invasions of sovereign nations, CIA overthrows, etc etc etc? Does it make it more right to "spread freedom" with the barrel of a gun or the assassination of a public figure? Can you honestly say that Islam is "dominating the world?" Who has the widest military coverage on the face of the earth? Which country preemptively invades other countries under the falsehood of lies? I'm sorry, but "spreading freedom" is the propagandistic term used to settle the stomachs of a queasy nation worried about if we're doing the right thing. When confronted with challenges to our national authority as the "policeman of the world," the media propaganda machines simply throw out "but we're spreading democracy and freedom!" Say that phrase enough, and people will start to believe it. When on the other hand...
Take a look at Afghanistan to see what Islamic domination is all about.
I'll take a look at Afghanistan if you take a look at our buddies in Saudi Arabia and Pakistan. We're so keen on spreading "democracy" throughout the world, we turn a blind eye to Saudi Arabia. Executions in the street? Sentencing a woman to prison because she was raped? Sounds like a great place to live. Yet we let them continue with what we deem as atrocities towards human rights. Afghanistan is more like the Wild West than a country. It has always been that way.
So please humor me and tell me what makes Afghanistan much more worse than Saudi Arabia in terms of "Islamic domination." I'm wondering what you are referring to here. Is it the government's policies? What?