Is the USA a “functioning” state with all the oppression, racism, greed, invading other countries out of monetarian interest and environment destruction?

I hope you realize that this is an incredibly privileged take. The US is rife with issues, but the hardships experienced by the average western citizen doesn't even compare to the suffering that you would find in, say, Pol Pot's Cambodia, or (to a less extreme extent) Maduro's Venezuela. To compare what a US citizen deals with on a daily basis due to capitalism to what a citizen of any of those countries had to go through is very reductive and may be perceived as disrespectful to many who had to live those experiences.