What were the negative consequences of the missile crisis?
One of the negative consequences of the crisis was that it frightened the American public, raised fear, and aided Americans' ability to invest large quantities of money in security to pursue the massive arms race with the Soviets. Another consequence was that the two nations established a better capacity to compromise and interact when they explored ways to prevent a full-fledged shooting war by utilizing back channels. In several cases, Kennedy used the crisis to make himself seem strong and capable. The recession brought the planet dangerously close to war, but it was averted. Despite the removal of Soviet missiles under UN supervision, Cuba remained communist and heavily armed.
The other consequence was on the American officials, the reality that nuclear-armed Cuban missiles were being deployed too near to the US mainland–just 90 miles south of Florida–heightened the urgency of the case. They could easily hit objectives in the eastern United States from that starting stage. The warheads, if permitted to become operational, would radically alter the nuclear competition between the United States and the Union of Soviet Socialist Republics (USSR), which had historically been controlled by the Americans.