Question: What was the population of the city that became a prosperous industrial town in the 19th century and that an American politician served as on the school Committee and the mayor?
Sentence (from "Ballyclare"): The town grew in the 19th century with the coming of the railway and it became an important industrial town with a large paper mill in the South West of the town and a large Linen Bleach Green .
Relevant evidence: No