manorial society. However, even these exceptions did not produce European-style manorial social, political and economic structures and with a few notable exceptions, did not result in the extravagant manor houses as found throughout Europe. Today, relics of early manorial life in the early United States are found in a few places such as the Eastern Shore of Maryland with examples such as Wye Hall and Hope House (Easton, Maryland), Virginia at Monticello and Westover Plantation, the Hudson River Valley of New York at Clermont State Historic Site or along the Mississippi such as Lansdowne (Natchez, Mississippi). Over time, these large estates were usually subdivided as they became economically unsustainable and are now a fraction of their historical extent. In the southern states, the demise of plantation slavery after the Civil War gave rise to a sharecropping agricultural economy that had similarities to European serfdom and lasted into the early 20th century. The Biltmore Estate in North Carolina (which is still owned by descendants of the original builder, a member of the Vanderbilt family) is a more modern, though unsuccessful, attempt at building a small manorial society near Asheville, North Carolina. Most manor-style homes built since the Civil War were merely country retreats for wealthy industrialists in the late 19th and early 20th century and had little agricultural, administrative or political function. Examples of these homes include Castle Hill (Ipswich, Massachusetts), Vanderbilt Mansion National Historic Site and Hearst Castle. A rare example of hereditary estate ownership in the United States that includes a manor-type house is Gardiners Island, a private island that has been in the same family since the 17th century and contains a Georgian architecture house. Today, some historically and architecturally significant manor houses in the United States are museums. However, many still function as private residences, including many of the colonial-era manor houses found in Maryland and Virginia a few of which are still held within the original families. Unlike in Europe, the United States did not create a native architectural style common to manor houses. A typical architectural style used for American manor-style homes in the mid-Atlantic region is Georgian architecture although a homegrown variant of Georgian did emerge in the late 1700s called Federal architecture. A typical example of a Georgian manor house is Tulip Hill in Maryland. Other styles borrowed from Europe include Châteauesque with Biltmore Estate being an example, Tudor Revival architecture see Planting