One starting point for building a movement capable of unleashing multiple rounds of collective action is an incubator campaign—a period of widespread unrest around a particular issue that may last several months or longer. The mobilizing success of the incubator campaign provides the resource infrastructure for subsequent episodes of related movement activity in similar geographical locations, even years into the future. We test these assertions by examining immigrant rights campaign activity in over 260 cities in California between 2006 and 2019. The incubator campaign was positively associated with producing local-level collective action in a wide range of like-minded campaigns sustaining a larger immigrant rights movement in the state. The findings also suggest that an incubator campaign’s influence may eventually decay over time. Still, newly infused protest campaigns can reactivate immigrant activist momentum to counter ongoing hostile political environments faced by excluded populations.

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