Question

to refuse to work in order to force an employer to meet certain demands
gilded age
boss tweed
assimilation
strike

Explanation:

The phrase "to refuse to work in order to force an employer to meet certain demands" is a classic definition of a strike. A strike is a collective action by workers to exert pressure on employers. Gilded Age refers to a historical period, Boss Tweed is a historical figure, and assimilation is a process of cultural integration. None of these match the given definition as precisely as "strike".

Answer:

strike