Title: Center of population
Content:  The mean center of the United States population (using the centroid definition) has been calculated for each U.S. Census since 1790. Over the last two centuries, it has progressed westward and, since 1930, southwesterly, reflecting population drift. For example, in 2010, the mean center was located near Plato, Missouri, in the south-central part of the state, whereas, in 1790, it was in Kent County, Maryland, 47 mi east-northeast of the future federal capital, Washington, D.C.
Title: Mean center of the United States population
Content:   The mean center of the United States population is determined by the United States Census Bureau from the results of each national census. The Bureau defines it as follows: After moving roughly 600 miles west by south during the 19th century, the shift in the mean center of population during the 20th century was less pronounced, moving 324 miles west and 101 miles south. Nearly 79% of the overall southerly movement happened between 1950 and 2000.
Title: Geographic center of the United States
Content:   This is distinct from the contiguous geographic center, which has not changed since the 1912 admissions of New Mexico and Arizona to the 48 contiguous United States, and falls near the town of Lebanon, Kansas. This served as the overall geographic center of the United States for 47 years, until the 1959 admissions of Alaska and Hawaii moved the geographic center of the overall United States approximately 550 miles northwest by north. While any measurement of the exact center of a land mass will always be imprecise due to changing shorelines and other factors, the NGS coordinates identify the spot as an uninhabited parcel of private pastureland approximately 12 miles east of the cornerpoint where the South Dakota–Wyoming–Montana borders meet. According to the NGS data sheet, the actual marker is "set in an irregular mass of concrete 36 inches below the surface of the ground." For public commemoration, a nearby proxy marker is located in a park in Belle Fourche, where one will find a flag atop a small concrete slab bearing a U.S. Coast and Geodetic Survey Reference Marker.
Title: List of geographic centers of the United States
Content:  Although there have been different definitions offered for the geographic center, an intuitive one, and one used by the USGS, is "the State of gravity of the surface, or that point on which the surface of the area would balance if it were a plane of uniform thickness." An updated list of geographic centers using this definition (which is equivalent to the state's centroid) is given below. It was derived by minimizing the sum of squared great circle distances from all points of land in a state (including islands, but not coastal waters, following the earlier practice of the USGS). It represents a slight improvement over the list originally published. The geographic center of the contiguous United States, determined in this way, is at 39.8355°N, -99.09083°W; this is 5.4 miles from Agra, Kansas, 5.7 miles from Kensington, Kansas, and 26.9 great circle miles west of the longstanding designated site near Lebanon, Kansas.
Title: Geographic center of the United States
Content:  The geographic center of the 48 contiguous or conterminous United States, determined in a 1918 survey, is located at 39.83333°N, -98.58333°W, about 2.6 mi northwest of the center of Lebanon, Kansas, approximately 12 mi south of the Kansas–Nebraska border. While any measurement of the exact center of a land mass will always be imprecise due to changing shorelines and other factors, the NGS coordinates are recognized in a historical marker in a small park at the intersection of AA Road and K-191. It is accessible by a turn-off from U.S. Route 281. It is distinct from the geographic center of the 50 United States located at a point northeast of Belle Fourche, South Dakota, reflecting the 1959 additions of the states of Alaska and Hawaii. In a technical glitch, a farmstead northeast of Potwin, Kansas, became the default geolocation of 600 million IP addresses (due to a lack of fine granularity) when the Massachusetts-based digital mapping company MaxMind changed the putative geographic center of the contiguous United States from 39.83333°N, -98.58552°W to 38°N, -97°W.
Title: Median center of United States population
Content:  The median center of U.S. population is determined by the United States Census Bureau from the results of each census. The Bureau defines it to be: As of the 2020 U.S. census, this places roughly 165.7 million Americans living on each side of a longitude line passing through a location in Gibson County, Indiana, and the same number living on each side of a latitude line through the same point. During the 20th century the median center of U.S. population moved roughly 180 miles southwest, from a location in Randolph County, Indiana to a location in Daviess County, Indiana. The majority of this southwest shift happened in the second half of the century, as the center shifted within a narrow circular band between 1900 and 1950 – all within roughly 25 miles of the 1900 starting point in Randolph County.
Title: Heartland (United States)
Content:  There is no consensus regarding the geographical boundaries of America's heartland. However, the American Midwest is the most commonly cited area as being the nation's heartland, although many other places have been referred to as part of it, often extending to rural or farming regions in the great plains. At least as early as 2010, the term Heartland has been used to refer to many so-called "red states", including those in the Bible belt. According to the United States Census Bureau, the mean center of population in the U.S. in 2010 was in or around Texas County, Missouri. In 2000 it had been northeast from there, in Phelps County, Missouri. It is projected for the mean center of population to leave the Midwest and enter the Western U.S. by the middle of the 21st century. The geographic center of the 48 contiguous U.S. states is near Lebanon, Kansas. When Alaska and Hawaii were admitted to the Union in 1959, the geographic center of the United States moved from Smith County, Kansas to Butte County, South Dakota.
Title: Geographic center of the United States
Content:  In 1918, the Coast and Geodetic Survey found this location by balancing on a point a cardboard cutout shaped like the U.S. This method was accurate to within 20 miles, but while the Geodetic Survey no longer endorses any location as the center of the U.S., the identification of Lebanon, Kansas, has remained.
Title: Nate Larson
Content:  and Culture in 2017. He has continued to work in long-term community partnerships at Jubilee Arts in West Baltimore and Commodore John Rogers in East Baltimore. Since 2014, he has worked on Centroid Towns, an anthology of stories connecting the cities that have been the mean center of the United States population. Since the first US census in 1790, the United States Census Bureau has recorded the mean center of population as it moves steadily west and south. The first recorded was near Chestertown, Maryland, and the projected centroid of the 2020 census is Hartville, Missouri. Larson has done preliminary research in all 25 towns and completed five chapters of the 
Title: Geographic center of the United States
Content:  In order to protect the privacy of the private land owner where the point identified by the 1918 survey falls, a proxy marker was erected in 1940 about half a mile away. Its inscription reads: The GEOGRAPHIC CENTER of the UNITED STATES LAT. 39°50' LONG. −98°35' NE 1/4 – SE 1/4 – S32 – T2S – R11W Located by L.T. Hagadorn of Paulette & Wilson – Engineers and L.A. Beardslee – County Engineer. From data furnished by U.S. Coast and Geodetic Survey. Sponsored by Lebanon Hub Club. Lebanon, Kansas. April 25, 1940 An American flag usually flies atop a pole placed on the monument. A covered picnic area and the U.S. Center Chapel, a small eight-pew chapel, are nearby.

Question: in what state was the united states center of population gravity located during the period 1790?
Answer: Maryland.
Kent County, Maryland.