Because of the large death toll and destruction of property along the Gulf Coast, the name Katrina was officially retired on April 6, 2006, by the World Meteorological Organization at the request of the U.S. government. The name will never again be used for another North Atlantic hurricane. It was replaced by Katia on List III of the Atlantic hurricane naming lists, which was used in the 2011 Atlantic hurricane season.
Operating under a new electoral law written unilaterally by the governing parties with strong criticism from the parliamentary opposition, the April 2006 general election was held. The results of this election handed Romano Prodi's centre-left coalition, known as The Union, (Berlusconi's opposition) a very thin majority: 49.8% against 49.7% for the centre-right coalition House of Freedoms in the Lower House, and a two-senator lead in the Senate (158 senators for The Union and 156 for the House of Freedoms).
On 11 April 2006, Adidas announced an 11-year deal to become the official NBA clothing provider. The company has been making NBA, NBDL, and WNBA jerseys and products as well as team-coloured versions of the "Superstar" basketball shoe. This deal (worth over $400 million) took over the previous Reebok deal that had been put in place in 2001 for 10 years.
Starting in 2004 a disarmament process was begun of Colombia's paramilitary groups (especially the AUC) and was completed on April 12, 2006, when 1,700 fighters turned in their weapons in the town of Casibare.
The construction of One World Trade Center began on April 27, 2006, and reached its full height on May 20, 2013. The spire was installed atop the building at that date, putting 1 WTC's height at 1,776 feet (541 m) and thus claiming the title of the tallest building in the Western Hemisphere.