Lone Star State - Texas was first ruled by Spain for over 300 years as a part of Mexico. When Mexico became an independent country in 1821, Texas became a Mexican State and new settlers from the United States were welcomed . The large influx of Americans led to skirmishes with Mexican troops. After a successful war of independence against Mexico, Texans raised the Lone Star flag over their own republic in 1836. Their government was recognized by the United States and several other European countries. In 1845 Texas accepted annexation by the United States and was admitted as the 28th state.