I want to know the answer to the following question:
What U.S. city kept observing DST to stay in sync with London, leading Chicago and Cleveland to follow along?
All the background I'm provided with is that "Only a few US cities retained DST locally thereafter, including New York so that its financial exchanges could maintain an hour of arbitrage trading with London, and Chicago and Cleveland to keep pace with New York.". Is that enough to answer the question?