Josiah and Mathias Wilbarger, Reuben Hornsby, Jacob M. Harrell, and John F. Webber were early settlers who moved into the area in the early 1830s. In 1836 Texas declared and won its independence from Mexico, forming a new Republic of Texas. After Texas Vice President Mirabeau B. Lamar visited central Texas during a buffalo-hunting expedition between 1837 and 1838, he proposed that the republic's capital (then located in Houston) be relocated to a site on the north bank of the Colorado River. In 1839 the site was officially chosen as the republic's new capital and given the name Waterloo, Texas; shortly thereafter the city's name was changed to Austin in honor of Stephen F. Austin. A new county was also established the following year, of which Austin would be the seat; the county was named Travis County, after William B. Travis. Though the Republic's capital moved briefly back to Houston during the events surrounding the Texas Archive War, by 1845 Austin was again the capital, and it became the capital of the new State of Texas when Texas was annexed by the United States later that year. In 1861 Travis County was one of the few Texas counties to vote against secession from the Union. Since the majority of the state did favor secession, Travis County then became a part of the Confederacy for the duration of the Civil War. After the Confederacy's defeat, Texas was fully readmitted to the Union in 1870. From the end of the Civil War to the early twenty-first century, Travis County has experienced steady, rapid population growth (averaging more than a 36% increase every decade from 1870 to 2010), driven largely by the growth of Austin and its suburbs; it is now the fifth most populous county in Texas, after Harris (Houston), Dallas, Tarrant (Fort Worth) and Bexar (San Antonio) counties. According to the U.S. Census Bureau, the county has a total area of , of which is land and (3.2%) is water. Travis County is located in the southern part of central Texas, between San Antonio and Dallas–Fort Worth. The county's geographical center lies two miles northwest of downtown Austin at 30°18' north latitude and 97°45' west longitude. Travis County straddles the Balcones Fault, the boundary between the Edwards Plateau to the west and the Texas Coastal Plain to the east. The western part of the county is characterized by the karst topography of the Texas Hill Country, while the eastern part exhibits the fertile plains and farmlands of the Blackland Prairie.