If what you said was true, that people being "free" was so important to the US and the reasoning behind all foreign policy, then please explain away slavery? Segregation? Discrimination? Explain the wars of aggression, which despite their operational Orwellian names, have had nothing to do with freedom, or freeing oppressed peoples. Explain policies of supporting brutal right wing dictators throughout Latin America, the training of death squads, the military school of the Americas, the CIA coups / assinations of democratically elected leaders, the torture prisons, the giving of asylum to those not only reported of being involved in the above, but charged (in their home countries).
If what you said was true, that the US really was the first, noble country doing everything to "free" oppressed peoples the above wouldn't happen, but it does. Unless you mean freedom is for some, oppression for others, that could be argued perhaps somewhat true, but if so, then it negates what you are saying.
This isn't to single out the US, as I said the same is true for all global power countries since the beginning of time, but the narrative that the US only starts wars in a selfless manner is quite frankly ridiculous and naive beyond belief to anyone who has even an elementary understanding of world history as opposed to home state propaganda