What term means mixing of races?

Sexual intercourse- and children being borne- of mixed races- Black and White, the most common example. it has long been a High Yellow ( in both sense of the Word) iof not Red-Line topic ( danger zone!) and very few movies have been done on it. inter-racial romance- even if it did not involve marriage or children, was likewise a ( Be-careful) if not forbidden subject. The Broadway Show (South Pacific) was largely built up on this plot vehicle- lead character dies as result of war action- so experiment failed.