Early 20th century term meaning "Excellent", used for a caramel coated popcorn-peanut treat

Cracker Jack  or crackerjack

Explanation:

Crackerjack is the slang term that means something is excellent and admirable, being it a person or a thing. For example: "He is really crackerjack in his field of expertise."

It is the term also taken for the branding of certain caramelized popcorn. Cracker Jack is an American brand of junk-food, one of the first that ever existed, for pop-corn and peanuts coated with caramel dressing, also made famous for a treat inside the package.

labor leaders and organizations had the power to demand it.

explanation:

workers got a five-day workweek because the bcea protects and respect the rights of the employees. labor leaders and other groups demanded it.

d) the constitution rights of native americans and their right to self-government on reservations