45th

45th or the 45th denotes the ordinal position of the number 45 in a sequence and appears across a range of domains. In government, the 45th United States Congress met from March 4, 1877 to March 3, 1879, during the Reconstruction era. The 45th president of the United States, Donald J. Trump, served from January 20, 2017 to January 20, 2021.

In geography, the 45th parallel north is a circle of latitude exactly 45 degrees north of the equator, marking roughly the midpoint between the equator and the North Pole and crossing parts of North America, Europe, and Asia. The term also appears in street names, such as 45th Street, a notable east–west artery in Midtown Manhattan and in other cities.

The 45th Infantry Division is a unit of the United States Army formed during World War II, known as the Thunderbird Division and active in multiple theaters, including North Africa and Europe. Utah is the 45th state to join the United States, admitted in 1896.

In culture and media, the 45th Academy Awards ceremony took place in 1973. The 45th anniversary is traditionally associated with sapphire and is observed in various commemorations. The ordinal 45th is also used broadly to label positions in lists, catalogs, and geographic coordinates, reflecting its role as a standard sequential marker in many systems.