The 50th U.S. state, Hawaii, was officially added to the Union on August 21, 1959.

Quick Scoop

  • The Admission Act for Hawaii was signed into law by President Dwight D. Eisenhower on March 18, 1959, laying the legal groundwork for statehood.
  • Hawaii’s statehood became effective on August 21, 1959 , which is the date it is recognized as the 50th state of the United States.
  • This made Hawaii the most recent state to join the Union, and the U.S. flag was updated to 50 stars the following year.

In short: when asking “when was the 50th state added,” the answer is August 21, 1959 , with Hawaii’s admission completing the current 50-state map.

TL;DR: Hawaii became the 50th state on August 21, 1959.

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