Labor unions have won some big victories in the past few years, including in the auto industry and Hollywood. But if organized labor is going to have a true resurgence in the United States, it can’t simply win raises for workers it already represents. It will need to organize new workers and reverse the decades-long decline in union membership.

That’s why recent events at Starbucks have been so significant. The company and the union — which represents more than 400 of Starbucks’s 10,000 U.S. stores — appear on track to reach a contract that will cover wages, benefits and disciplinary policies.

This would be a major milestone. Even after workers win a union election, companies often drag their feet when bargaining a contract. If years pass with little or no progress, union supporters may get demoralized and leave, causing the union to unravel.

By contrast, a contract could encourage workers to unionize across Starbucks and other food and beverage chains, which are part of an industry that is overwhelmingly nonunion.

What’s remarkable about the Starbucks development is that it comes after the company spent years resisting the union campaign, which began in Buffalo in 2021. Starbucks’s former chief executive, Howard Schultz, portrayed organizers as outside agitators. He warned employees not to be “distracted” by them.

But in February the two sides announced that they would soon begin hashing out a framework for a contract. What explains the turnaround? In today’s newsletter, I’ll explain four key factors.