Step 1 : Introduction to the question "What official term has the U.S. government adopted for America's 250th anniversary celebration?"
...The official term for America’s 250th anniversary is the United States Semiquincentennial. The word “semiquincentennial” refers to a 250th anniversary, and the milestone will mark 250 years since the adoption of the Declaration of Independence in 1776. While "America 250" is widely used as a shorter promotional name for events, exhibits, and public celebrations, the formal government term is the United States Semiquincentennial. The anniversary is being marked with nationwide celebrations of America's founding, history, and ideals.