[Answer] What American city dyes its river green for St. Patrick's Day?

Step 1 : Introduction to the question "What American city dyes its river green for St. Patrick's Day?"

...Every St. Patrick's Day, the city of Chicago takes about 40 pounds of concentrated dye and pours it into the Chicago River, making it green for a full city block. The tradition dates back to 1962, when the Chicago Plumbers Union began coloring the river using a secret, non-toxic recipe. It usually takes less than an hour to finish the job, and afterward, the water stays a vibrant green for 24 to 48 hours — more than enough time to celebrate the day in style.

Step 2 : Answer to the question "What American city dyes its river green for St. Patrick's Day?"

Chicago:

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