After Mexico gained independence in 1821, Mexican Texas legally permitted an influx of English-speaking Anglo settlers from the United States (mainly the Southern United States), who within a decade outnumbered Hispanics in Texas, making English as common as Spanish in central and north Texas. After Texas became an independent republic in 1836, English, with its distinct Southern influences, became the predominant language. After the Mexican Revolution of 1910-1920, a great number of Spanish-speaking Mexicans immigrated to Texas, slowing down in the mid-20th century only to increase massively since 1990, driving the development of a young Spanish-influenced dialect of Texan English: Tejano English.