to sit apart from the rest of the students in the classrooms and library, and could eat in the cafeteria only at a designated table. A unanimous Court, through Chief Justice Fred M. Vinson, said that Oklahoma had deprived McLaurin of the equal protection of the laws: The present situation, Vinson said, was the former. In Sweatt, the Court considered the constitutionality of Texas's state system of law schools, which educated blacks and whites at separate institutions. The Court (again through Chief Justice Vinson, and again with no dissenters) invalidated the school system—not because it separated students, but rather because the separate facilities were not equal. They lacked "substantial equality in the educational opportunities" offered to their students. All of these cases, as well as the upcoming Brown case, were litigated by the National Association for the Advancement of Colored People. It was Charles Hamilton Houston, a Harvard Law School graduate and law professor at Howard University, who in the 1930s first began to challenge racial discrimination in the federal courts. Thurgood Marshall, a former student of Houston's and the future Solicitor General and Associate Justice of the Supreme Court, joined him. Both men were extraordinarily skilled appellate advocates, but part of their shrewdness lay in their careful choice of which cases to litigate, selecting the best legal proving grounds for their cause. Brown and its consequences In 1954 the contextualization of the equal protection clause would change forever. The Supreme Court itself recognized the gravity of the Brown v Board decision acknowledging that a split decision would be a threat to the role of the Supreme Court and even to the country. When Earl Warren became Chief Justice in 1953, Brown had already come before the Court. While Vinson was still Chief Justice, there had been a preliminary vote on the case at a conference of all nine justices. At that time, the Court had split, with a majority of the justices voting that school segregation did not violate the Equal Protection Clause. Warren, however, through persuasion and good-natured cajoling—he had been an extremely successful Republican politician before joining the Court—was able to convince all eight associate justices to join his opinion declaring school segregation unconstitutional. In that opinion, Warren wrote: Warren discouraged other justices, such as Robert H. Jackson, from publishing any concurring opinion; Jackson's draft, which emerged much later (in 1988), included this statement: "Constitutions are easier