Unprecedented or whatever

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Across
  1. 2. Site of a 1969 Cornell takeover
  2. 4. One of four at North Carolina A&T
  3. 6. Subject of 14-Across teach-in
  4. 7. Demand for 4A,18A, 1D, 9D
  5. 12. Nashville liberal arts college president, outed in 1925 boycott
  6. 14. Ann Arbour school, first to host teach-in
  7. 16. Organising party in 17-Across
  8. 17. Site of a 1964 Berkeley takeover
  9. 18. One of four at North Carolina A&T
Down
  1. 1. One of four at North Carolina A&T
  2. 3. Study programme resulting from 2-Across
  3. 5. ACAB at NYU, NSSR
  4. 8. Brutalist design feature common to US campuses
  5. 9. One of four at North Carolina A&T
  6. 10. Study Programme resulting from 13-Down
  7. 11. Violent actors in 1970 massacre
  8. 13. Site of a 1996 Columbia takeover
  9. 15. Nashville liberal arts college alumnus, supporter of 1925 boycott
  10. 19. ACAB at UC