Answer:
Tile 1: US blockade of Cuba __->__ Box 1: US blockade of Cuba
Tile 2: Soviet Union set up missile sites in Cuba __->__ Box 2: Soviet Union set up missile sites in Cuba
Tile 3: US discovered the missile sites __->__ Box 3: US discovered the missile sites
Tile 4: President Kennedy issued a statement condemning the missile presence __->__ Box 4: President Kennedy issued a statement condemning the missile presence