alternatehistory.com

On June 30, 1908 a small rock from space entered our atmosphere and exploded in the air over the Tunguska area in Russia with a blast around 15 megatons.

Instead of exploding over the remote Siberia, it's over a random spot in New England. What would be the consequences of this? How about the casualties? Would it do enough damage, even without hitting a major city, to have long-term effects on the area, and perhaps the world?
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