Asking me to stop will not change facts.
Slavery was abolished in 1865, let us see what other things happened after that and what China is doing to Muslims is a page from the exactly same book.
1. 1882 - US government kicked out Chinese (and Indian) people from USA by enacting purely racist law called "Chinese Exclusion Act". Not only Chinese citizens were kicked out but citizenships were revoked retrospectively. The remenants of this law can be seen even today in green card country wise caps on India and Chinese. Cancellation of H4-EAD is just an example of how US admin has institutional racism against Indians and Chinese people.
2. 1942 - Internment of Japanese Americans. Absolutely disgraceful and yet exactly same as what China is doing to Muslims.
3. Forced sterilisation of people in early 20th century. China at least allowed people to have one child. http://www.pbs.org/independentlens/blog/unwanted-sterilizati...
4. https://en.wikipedia.org/wiki/Tuskegee_syphilis_experiment US government knowingly decides to let syphilis spread among black males.
5. There is an entire wiki article about other unethical medical experiments USA did on blacks https://en.wikipedia.org/wiki/Unethical_human_experimentatio...
6. The current laws like Civil Asset Forfeiture and Marijuana prohibition targets black families and people from low income families depriving them of their own money and freedom.
I am not even coming to the topic of how USA had destabilised perfectly stable countries like Iraq, killed thousands of innocent people, maimed thousands of people and children, bombed hospitals, killed babies, raped women and children across Afghanistan and Iraq here.
Post-slavery US behavior is far more favorable and accommodating to human rights than China today. Your comparison between the US and China is false and misguided. Individual rights are generally cherished and protected in the US; in China they are stomped upon by the Communist boot.