How did the U.S. confirm that there were missiles in Cuba?

Question

Cuba sent postcards of the missiles to taunt the U.S
They just guessed
US Spy planes
Soviets informants

Answer 1

The U.S. confirmed that there were missiles in Cuba primarily through U.S. spy planes. Specifically, U.S. reconnaissance flights, especially those using U-2 spy planes, provided photographic evidence of the Soviet missile installations in Cuba during the Cuban Missile Crisis in October 1962. This intelligence was crucial in informing U.S. decisions and actions during the crisis.