The incident also influenced public safety legislation. As a result of the sabotage techniques used by Germany, and the United States' declaration of war on Germany, led to the creation of the Espionage Act passed by congress in late 1917. Landfill projects later made Black Tom Island part of the mainland, and it was incorporated into Liberty State Park. The former Black Tom Island is at the end of Morris Pesin Drive in the southeastern corner of the park, where a plaque marks the spot of the explosion. A circle of U.S. flags complements the plaque, which stands east of the visitors' center.