In 1863, what development caused four days of the worst rioting Americans had yet seen?

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The draft law, officially known as the Enrollment Act, was passed in 1863 during the American Civil War. It required the enrollment of every male citizen and those immigrants who had filed for citizenship between ages 20 and 45. The law allowed for draftees to hire substitutes or pay a commutation fee to avoid service, which led to widespread resentment among the working class, culminating in the New York City draft riots, the worst rioting Americans had yet seen by that time.

In 1863, What Development Caused Four Days of the Worst