November 16, 1907. The newly created state legislature passed racial segregation laws, commonly known as Jim Crow laws, as its first order of business. The 1907 Oklahoma Constitution did not call for strict segregation; delegates feared that, should they include such restrictions, U.S. President Theodore Roosevelt would veto the document. Still, the first law passed by the new legislature segregated all rail travel, and voter registration rules effectively disenfranchised non-whites. This meant that they were also barred from either serving on juries or serving in local public offices. These laws were enforced until they were ruled unconstitutional after the passage of the federal Voting Rights Act of 1965. Major cities passed laws that imposed additional restrictions. On August 4, 1916, Tulsa passed an ordinance that mandated residential segregation by forbidding members of either race from residing on any block where three-fourths or more of the residents were members of the other race. Although the United States Supreme Court declared such an ordinance unconstitutional the following year, Tulsa and many other cities continued to establish and enforce segregation for the next three decades. Many servicemen returned to Tulsa following the end of the First World War in 1918, and as they tried to re-enter the labor force, social tensions and white supremacist sentiment increased in cities where job competition was fierce. An economic slump in Northeastern Oklahoma increased the level of unemployment. The American Civil War, which ended in 1865, was still in living memory; civil rights for African Americans were lacking. The Ku Klux Klan was resurgent (influenced by the popular 1915 film The Birth of a Nation). Since 1915, the Ku Klux Klan had been growing in urban chapters across the country. Its first significant appearance in Oklahoma occurred on August 12, 1921. By the end of 1921, 3,200 of Tulsa's 72,000 residents were Klan members, according to one estimate. In the early 20th century, lynchings were common in Oklahoma as part of a continuing effort to assert and maintain white supremacy. By 1921, at least 31 people, mostly men and boys, had been lynched in the newly formed state; 26 were Black. At the same time, Black veterans pushed to have their civil rights enforced, believing that they had earned full citizenship as the result of their military service. In what became known as the "Red Summer" of 1919, industrial cities across the Midwest and Northeast experienced severe