Conversation so far:
Why is Boise called the city of trees?
Boise has long been called the “City of Trees,” but in 1863, when the town was platted on a dry sagebrush plain between the newly established military post and Boise River, the nearest trees to be seen were cottonwoods and willows along the river and pines and firs miles away

Question: How did it get its name
Self-contained rewrite: How did Boise get its name?