The Walnut Hill Plantation cotton gin house was built in the mid to late 1840s by Alonzo T. Mial, a prominent planter and commission merchant in 19th century North Carolina.
 It holds the distinction of being one of only a few surviving cotton gin houses in the state, and is likely the only one to have retained the majority of its original ginning equipment.
Browntown is a national historic district located near Johnsonville, Florence County, South Carolina.
 The district encompasses 7 contributing buildings and 4 contributing structures reflecting the self-sufficient way of life practiced by several generations of the Brown family during the 19th and early-20th centuries.
 Moses Brown and his son and grandsons were self-sufficient farmers who operated their own brick kiln, grist mill, lumber mill, cotton gin, retail and wholesale mercantile business, and school.
 The property nominated includes the cotton gin building, three residences, the school, a tobacco barn, and several outbuildings.
 Browntown includes examples of both log and frame construction, and are grouped in two complexes, one group adjacent to the road and the other across the fields around the cotton gin building.
The Hanger Cotton Gin is a historic cotton gin in Sweet Home, Arkansas.
 Built about 1876, it is a rare surviving example of a steam-powered gin.
 The main building is a three-story frame structure covered in board-and-batten siding.
 The gin was only operated commercially for a brief period, and was out of service by 1892.
 Since then, the building has been used as a barn and grain storage facility.
 It was probably built by Peter Hanger, whose family has been prominent in the Little Rock business community since that time.
The John H. Johnston Cotton Gin Historic District encompasses a historic cotton gin in the small community of Levesque, Arkansas.
 The main building of the gin was built in 1941, and was built out of reinforced concrete, instead of the more usual steel, owing to a metal shortage in World War II.
 It has some Moderne styling, with smooth surfaces and rounded corners.
 The gin also distinctively incorporates a seed storage facility at its rear.
 Its ancillary structures, which include a shed, privy, and cyclone structure, are wood-framed with metal siding and roofing.
Speight House and Cotton Gin is a historic home and cotton gin located at Edenton, Chowan County, North Carolina.
 It was built in 1900, and is a two-story, "L"-shaped, Queen Anne-style brick dwelling with a hipped roof.
 It features three full-height projecting demi-octagonal bays and spacious wraparound verandah.
 The cotton gin was built about 1901-1902, and is a brick "L"-shaped building with a one-story main block and two-story ell.
 Also on the property are a contributing smokehouse and other dependencies.
The Judd Hill Cotton Gin is a historic cotton gin in Judd Hill, Arkansas.
 The gin was part of the Judd Hill Plantation, which was established by businessman Orange Judd Hill in the 1920s and sold to Hill's daughter and her husband, Esther and Samuel Chapin, in 1933.
 The cotton gin was built on the plantation circa 1930; its brick construction, designed to prevent fires, makes it a rarity among extant cotton gins.
 The plantation was successful throughout the 1940s and became one of the largest farms in Poinsett County.
 The cotton gin ceased operations in the 1970s or 1980s, but the plantation is still operated by the Judd Hill Foundation established by Esther Chapin.
 On September 28, 2005, the cotton gin was added to the National Register of Historic Places.
Mulberry Grove Plantation, located north of Port Wentworth, Chatham County, Savannah, was a rice plantation, notable as the location where Eli Whitney invented the cotton gin.
The Kemp Cotton Gin Historic District encompasses the only cotton gin extant in the Rohwer area of Desha County, Arkansas.
 The gin was built in 1950 by O. O. Kemp, a few years after the closure of the Rohwer War Relocation Center, where as many as 10,000 Japanese-Americans were interned during the Second World War.
 After the center's closure much of its land was returned to agricultural use, and Kemp built this gin near the Missouri Pacific Railroad line that ran through Rohwer.
 In addition to the gin, the complex Kemp built includes a pump house, scale house, and office.
 This entire complex was listed on the National Register of Historic Places in 2005.
The Floyd Cotton Gin is a historic cotton gin at the junction of Arkansas Highway 31 and Arkansas Highway 305 in Floyd, Arkansas.
 It is a two-story wood frame building roughly L-shaped with a single-story section extending its southern end and a two-story section projecting east under a continuation of the sloping gabled roof.
 This gin was built in the 1930s, when White County was one of the nation's leading producers of cotton.
 It is one of five gins in the county to survive from that period.
Plantations were an important aspect of the history of the American South, particularly the antebellum (pre-American Civil War) era.
 The mild subtropical climate, plentiful rainfall, and fertile soils of the American Southeast allowed large plantations to flourish; where large numbers of workers, usually Africans held captive for slave labor, were required for agricultural production.

Question: What is the climate of the plantation where the cotton gin was invented?
Answer: The mild subtropical climate