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The
Town of Mount Pleasant covers 28 square miles and includes the
villages of Sleepy Hollow, Pleasantville, and a portion of
Briarcliff Manor as well as the hamlets of Hawthorne, Pocanico
Hills, thornwood and Valhalla. Mount Pleasant was one of the
original 20 townships in Westchester County. The Town of Mount
Pleasant fell under the auspices of the Manor Philipsburg which was
granted by the British Crown in 1693 to Frederick Philipse. At this
time, tenant farmers began developing tracts of land in Mount
Pleasant: Isaac See settled in what is now Thornwood; and
settlements flourished in Valhalla, the Eastview area of Valhalla
called Young's Corner (now Hlythedale), Hawthorne and the old
village of Pleasantville. From 1840 to 1920, Mount Pleasant
witnessed several events which facilitated its growth. In 1842, the
Croton Aqueduct was completed and many of the project workers
decided to settle there. Then the introduction of railroad service
to Mount Pleasant in 1849 caused a population boom and encouraged a
shift from growing subsistence crops to dairy farming since the
railroad could transport milk daily to NYC. After the Civil War,
many wealthy families and manufacturers moved up from NYC and
brought prosperity to the area. NYC's need for water led to the
construction of an earth way and spillway in Valhalla in 1887,
followed by the Kensico Reservoir and Valhalla Dam in 1915, the
construction of which caused the demise of the hamlet of Kensico (it
was incorporated into Valhalla). Mount Pleasant grew slowly
from 1920 to 1945, since parkway construction bypassed the village
centers. This left local residents with only limited access roads,
which allowed Mount Pleasant to retain a rural flavor. After W.W.II,
large-scale growth occurred and in the 1970's Mount Pleasant
underwent commercial development, especially along route 9a and
Columbus Ave.
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