Can You Solve This Unsolved Mystery? Who Was Behind the Wall Street Bombing of 1920?

On a September day in 1920, during the busy lunch rush on Wall Street, an ordinary-looking man drove a cart with an old horse near the U.S. Assay Office, across from the J.P. Morgan building. He parked the cart, got down, and quickly vanished into the crowd.

Minutes later, the cart exploded, unleashing a barrage of metal fragments.

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