Bowling Green Industrial Academy became part of the Caroline County school system in 1914 when the board of trustees donated the school and land to the Caroline
County School Board. The name of the school was changed
to Caroline County Training School. George Hays Buchanan was the principal and Rev. L. L. Davis continued as the
agricultural teacher. The school was
designed to train teachers for Negro schools.
Caroline County School Board now owned the school, the Sunday School Union still
remained responsible for operating and supporting the school. The School Board provided the teachers and
paid their salaries. The Sunday School
Union was responsible for providing most of the fuel and was solely responsible
for all room and board.
During the 1928–1929
school year, Caroline County Training School qualified for accreditation
from the Board of Education. The school was accredited by the Virginia State Board of Education as a high
school offering four-year courses in vocational agriculture in 1930 and the name was changed to Union High School.