original: In 1845 it joined the United States as the 28th state.
simplifications: In 1845 it became the 28th state of the USA. Texas joined the union in 1845. It is the 28th state. In 1845, it joined the United States. It was the 28th state. It became the 28th State in the USA in 1845. In 1845, it joined the United States. It Joined the United States as the 28th state in 1845 It joined the United States at the 28th state in 1845. In 1845 it became the 28th state of the US. The Republic of Texas became the 28th U.S. state in 1845. It joined the United States as the 28th state in 1845.