Question: The 2170 mile Oregon Trail connected various towns along a 150 mile long valley, forms the cultural and political heart of Oregon, and is home to three of Oregon's largest cities, including which city that is the state capital?
Sentence (from "Willamette Valley"): It forms the cultural and political heart of Oregon, and is home to approximately 70 percent of its population including its three largest cities: Portland, Eugene and Salem, the state capital.
Relevant evidence: Yes