The difference is simple and clear
The blacks were AMERICAN Citizens wanting to be treated like equals. Our ancestors brougt them here by force and madde them slaves. MLK fought hard to give blacks the same rights as whites. He deserves his day to celebrate and honor him.
The illegals will never have that day because they came here of their own free will and demand rights and refuse to be American.... They choose to be paid little. They should be happy they get more then the criminals in prision do.