Nazism isn't necessarily antisemitic, but totalitarian, race based fascism. Hitler didn't hate just the Jews, they were just the most convenient and plentiful enemy available in Germany at that time (we didn't have many black slaves in the country for example, plus the Jews were a tried and tested enemy due to widespread antisemitic tendencies in the christian population).
He also didn't care for most other races and ethnic groups and wanted them either to serve as a subservient class to the aryans (some eastern europeans for example), deport and "contain" them in their countries of origin (iirc most asian peoples) or, as with the jews, exterminate them by various means such as forced labor.
No, Hitler specifically hated Jews. Just because he had unfavorable opinions about other "races," his main goal was to eliminate the Jews. Let's not rewrite history here.
I agree, let us not do that, let us not pretend he was only after jews. Many other marginalized groups or "inferior" ethnicities were sent to the same death camps.
Yes, others were sent to the death camps built as a "final solution" to the "Jewish problem."
There were people in the USA who were slaves but not African American. It would be a historical abomination to claim that slavery was as much an Irish or Chinese or Native American problem.
2/3 of Jews in the Europe were murdered. The Jewish population today is still less than in 1933. There is no other group that was targeted and murdered at the same scale by the Nazis, although they committed genocide against several groups, not just the Holocaust. There is no other group that the Nazis brought from outside the Reich to murder, or tried to have murdered in foreign countries.