What is the birthday of the United States Space Force?

The United States Space Force was officially established on December 20, 2019, making it the newest branch of the U.S. Armed Forces. This date marks the moment when the Space Force became a separate and distinct entity within the Department of the Air Force, focusing on the organization, training, and equipping of space forces to protect U.S. and allied interests in space. This establishment reflects the increasing importance of space in national security, defense strategies, and global military operations. The other dates provided in the options relate to significant events in different contexts: July 4, 1776, is Independence Day, November 11, 1918, marks the end of World War I, and January 1, 2000, has significance related to the turn of the millennium, but none are associated with the formation of the Space Force.