June 1944 and held about 8,000. Fall of segregation After the Supreme Court ruled segregation in public schools unconstitutional in Brown v. Board of Education of Topeka, Kansas (1954), some students worked to integrate schools in the state. The Little Rock Nine brought Arkansas to national attention in 1957 when the federal government had to intervene to protect African-American students trying to integrate a high school in the capital. Governor Orval Faubus had ordered the Arkansas National Guard to help segregationists prevent nine African-American students from enrolling at Little Rock's Central High School. After attempting three times to contact Faubus, President Dwight D. Eisenhower sent 1,000 troops from the active-duty 101st Airborne Division to escort and protect the African-American students as they entered school on September 25, 1957. In defiance of federal court orders to integrate, the governor and city of Little Rock decided to close the high schools for the remainder of the school year. By the fall of 1959, the Little Rock high schools were completely integrated. Geography Boundaries Arkansas borders Louisiana to the south, Texas to the southwest, Oklahoma to the west, Missouri to the north, and Tennessee and Mississippi to the east. The United States Census Bureau classifies Arkansas as a southern state, sub-categorized among the West South Central States. The Mississippi River forms most of its eastern border, except in Clay and Greene counties, where the St. Francis River forms the western boundary of the Missouri Bootheel, and in many places where the channel of the Mississippi has meandered (or been straightened by man) from its original 1836 course. Terrain Arkansas can generally be split into two halves, the highlands in the northwest and the lowlands of the southeast. The highlands are part of the Southern Interior Highlands, including The Ozarks and the Ouachita Mountains. The southern lowlands include the Gulf Coastal Plain and the Arkansas Delta. This split can yield to a regional division into northwest, southwest, northeast, southeast, and central Arkansas. These regions are broad and not defined along county lines. Arkansas has seven distinct natural regions: the Ozark Mountains, Ouachita Mountains, Arkansas River Valley, Gulf Coastal Plain, Crowley's Ridge, and the Arkansas Delta, with Central Arkansas sometimes included as a blend of multiple regions. The southeastern part of Arkansas along the Mississippi Alluvial Plain is sometimes called the Arkansas Delta. This region is a flat landscape of rich alluvial soils formed by