On this date in 1803, the United States signed a treaty with France to purchase the Louisiana Territory. This bargain land acquisition doubled the size of the young nation and eventually became the states of Arkansas, Colorado, Iowa, Kansas, Louisiana, Minnesota, Missouri, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, and Wyoming (all or in part).
Purchs* is a lowest-probability typo with only 1 result in OhioLINK. There are, however, a fair number in WorldCat, including one for a musical play about the Louisiana Purchase.
Louisiana became the 18th state on this same day in 1812.
(Map showing the Louisiana Purchase, from Wikimedia Commons)