A bolide that was similar in size to the one over the Amazon exploded about 15 kilometers above Spain a couple of years later, releasing the equivalent of about 200 kilotons of TNT.
If we got a bolide like that over the US, or The Soviet Union, during the Cold War, would any of us still be alive? I expect the Tunguska explosion would have been seen as a first strike, and then we all would have been vaporized.
