The Manifest Destiny is a term that was used in the 1800's that stated that the United States was destined to expand all across the North American continent. The term was used to describe the United States expanding westward. The term was also used to describe the United States annexing land in the Spanish-American War. The term was first used in print in 1839. The term was was used by John O'Sullivan in 1845 for the annexation of Texas. It was originally just a catch phrase, but is now a historical term used to describe United States expansion in this era.