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The Croton Dam and Aqueduct was started in 1837 and completed in 1842; now a National Historic Landmark, the Croton Aqueduct is thought about among the fantastic engineering achievements of the 19th century. In the 1840s, the very first railroads were integrated in Westchester, and consisted of the New York and Harlem Railway, the Hudson River Railway, and the New York City and New Sanctuary Railway.

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By 1860, the overall county population was 99,000, with the most inhabited city being Yonkers. The period following the American Civil War allowed entrepreneurs in the New york city location to produce fortunes, and numerous constructed large estates, such as Lyndhurst, in Westchester. Throughout the latter half of the 19th century, Westchester's transport system and workforce brought in a manufacturing base, especially along the Hudson River and Nepperhan Creek.

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These would later on divide from Manhattan to form a county. During the 20th century, the rural character of Westchester would transform into the suburban county understood today. The Bronx River Parkway, completed in 1925, was the first modern-day, multi-lane limited-access roadway in North America.  Keep Checking Back Here  of Westchester's parks and parkway systems supported existing communities and encouraged the establishment of brand-new ones, changing the development pattern for Westchester.

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By 1950, the total county population was 625,816. Significant interstate highways were constructed in Westchester throughout the 1950s and 1960s. The establishment of these streets, along with the building of the Tappan Zee Bridge, led to additional development in the county. Geography [modify] Harbors, islands and shoreline of New Rochelle, Westchester County lies in the New York urban location and Downstate New York, north of New york city City and south of Upstate New York City.

It is verged on the west side by the Hudson River and on the east side by the Long Island Sound and Fairfield County, Connecticut. According to the U.S. Census Bureau, the county has a total location of 500 square miles (1,300 km2), of which 430 square miles (1,100 km2) is land and 69 square miles (180 km2) (14%) is water.