The two state universities, along with Oklahoma City University and the University of Tulsa, rank among the country's best in undergraduate business programs. Oklahoma City University School of Law, University of Oklahoma College of Law, and University of Tulsa College of Law are the state's only ABA-accredited institutions. Both University of Oklahoma and University of Tulsa are Tier1 institutions, with the University of Oklahoma ranked 68th and the University of Tulsa ranked 86th in the nation. Oklahoma holds eleven public regional universities, including Northeastern State University, the second-oldest institution of higher education west of the Mississippi River, also containing the only College of Optometry in Oklahoma and the largest enrollment of Native American students in the nation by percentage and amount. Langston University is Oklahoma's only historically black college. Six of the state's universities were placed in the Princeton Review's list of best 122 regional colleges in 2007, and three made the list of top colleges for best value. The state has 55 post-secondary technical institutions operated by Oklahoma's CareerTech program for training in specific fields of industry or trade. In the 2007–2008 school year, there were 181,973 undergraduate students, 20,014 graduate students, and 4,395 first-professional degree students enrolled in Oklahoma colleges. Of these students, 18,892 received a bachelor's degree, 5,386 received a master's degree, and 462 received a first professional degree. This means the state of Oklahoma produces an average of 38,278-degree-holders per completions component (i.e. July 1, 2007June 30, 2008). National average is 68,322 total degrees awarded per completions component. Beginning on April 2, 2018, tens of thousands of K–12 public school teachers went on strike due to lack of funding. According to the National Education Association, teachers in Oklahoma had ranked 49th out of the 50 states in terms of teacher pay in 2016. The Oklahoma Legislature had passed a measure a week earlier to raise teacher salaries by $6,100, but it fell short of the $10,000 raise for teachers, $5,000 raise for other school employees, and $200 million increase in extra education funding many had sought. A survey in 2019 found that the pay raise obtained by the strike lifted the State's teacher pay ranking to 34th in the nation. The Cherokee Nation instigated a ten-year plan that involved growing new speakers of the Cherokee language from childhood as well as speaking it exclusively at home. The plan was part of an ambitious goal that in fifty years would have at least 80% of their people fluent.