July 17, 1955 – Disneyland is dedicated and opened by Walt Disney in Anaheim, California.
July 18, 1947 – President Harry Truman signs an Executive Order formally determining the line of succession for the Presidency beyond that of Vice-President (i.e., Speaker of the House, Senate President, etc.) and includes how to handle cases of disability. This later becomes the basis of the 25th Amendment to the Constitution which is ratified in 1967.
July 20, 1969 – Watched by a worldwide audience, the U. S. Apollo 11 crew successfully makes the first manned landing on the Moon in “The Sea of Tranquility.” Astronaut Neil Armstrong took his first step onto the moon six and a half hours later.
July 21, 1853 – Central Park in New York is created when the New York State Legislature puts aside more than 750 acres of land on Manhattan Island. The park was designed by Frederick Law Olmsted and Calvert Vaux and is considered a masterpiece of landscape architecture.