Why are hula hoops in we didn't start the fire?

In "We Didn't Start the Fire," hula hoops symbolize the post-World War II era's cultural phenomena and fads that captured the public's imagination. Their mention reflects the rapid changes and the youthful spirit of the 1950s, highlighting how such trends are part of the larger historical narrative. The song lists events and trends to emphasize that while new issues arise, the cycle of history continues, and these fads are as significant as major historical events.