Line chart showing union membership rates by nativity from 1994 to 2025. A light teal line represents US-born workers and a dark teal line represents foreign-born workers. Union membership rates decline for both groups over time. US-born workers consistently have higher unionization rates than foreign-born workers, falling from about 16 percent in the mid-1990s to roughly 10 percent in 2025. Foreign-born workers’ unionization rates declined from about 13 percent to around 8 percent over the same period.