According to Newsweek, two broods — or populations — of cicadas, labeled as Brood XIII and Brood XIX, will co-emerge from the ground in 2024 for the first time in 221 years. For the first time in 221 years, Broods XIII and XIX of periodical cicadas are emerging simultaneously, overlapping in Illinois. The last recorded occurrence of these cicadas simultaneously emerging was in 1803, when the Louisiana Purchase was made, and the third U.S. president, Thomas Jefferson, was still in office, per Business Insider.