Question: When did the first Walmart open in the state where Elk Landing is located?

full_context: Document 1: Enoch Jones House: Enoch Jones House, also known as "Boxwood," is a historic home located near Clayton, Kent County, Delaware. It dates to the mid-18th century, and consists of a two-story, three bay, brick main house with a lower two-story frame west wing. The house is in the hall-and-parlor plan. It has a gable roof on both sections. The first documented reference to the house is a 1792 survey of Enoch Jones 717-acre estate.
Document 2: History of Walmart: In 1991, the company expanded into Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, and New York. Walmart expanded worldwide this year, with the opening of their first store outside the United States in Mexico City. They also acquired Western Merchandisers, Inc. of Amarillo, Texas. 1991 also saw the launch of the Sam's American Choice brand of products.
Document 3: Elk Landing: Elk Landing is the name of a historic home located at Elkton, Cecil County, Maryland. The house at Elk Landing was listed on the National Register of Historic Places in 1984.
Document 4: History of Walmart: In April 1983, the company opened its first Sam's Club store, a membership - based discount warehouse club, in Midwest City, Oklahoma. They also expanded into Indiana, Iowa, New Mexico, and North Carolina and implemented ``people greeters ''in all of their stores. The first stores opened in Virginia in 1984.
Document 5: History of Walmart: In 1981, Wal - Mart expanded into the southeastern US market, opening stores in Georgia and South Carolina, and acquiring 92 Kuhn's Big K stores. They expanded into Florida and Nebraska in 1982.
Document 6: History of Walmart: By 1977, Wal - Mart expanded into Illinois and made its first corporate acquisition, assuming ownership and operation of the Mohr - Value stores, which operated in Missouri and Illinois. This was followed by the acquisition of the Hutcheson Shoe Company in 1978. In the same year Walmart also branched out into several new markets, launching its pharmacy, auto service center, and jewelry divisions.
Document 7: Old Eagle Tavern: Old Eagle Tavern is located in Trenton, Mercer County, New Jersey, United States. The building was built in 1765 by Robert Waln and added to the National Register of Historic Places on November 3, 1972. The building operated as a tavern and hotel from 1765 to 1896.
Document 8: Wilton (Wye Mills, Maryland): Wilton is a historic home located at Wye Mills, Queen Anne's County, Maryland. It consists of the original brick structure, built between 1749 and 1770, which is a three-bay, -story block, approximately 22 feet by 26 feet. About 1800 a major Flemish bond brick addition was made to the house.
Document 9: Ludwick Rudisel Tannery House: The Ludwick Rudisel Tannery House, also known as Motter Place, is a historic home located at Taneytown, Carroll County, Maryland, United States. The main block is constructed of brick on a fieldstone foundation, five bays in length, two deep, with an original slate roof, built about 1807. Attached is a two-story, two-bay-long brick kitchen. The house features Georgian massing and fine Federal detailing.
Document 10: Walmart: Walmart Inc. Walmart's current logo since 2008 Walmart's official headquarters in Bentonville, Arkansas Formerly called Wal - Mart, Inc. (1969 -- 70) Wal - Mart Stores, Inc. (1970 -- 2018) Type Public Traded as NYSE: WMT DJIA component S&P 100 component S&P 500 component ISIN US9311421039 Industry Retail Founded July 2, 1962; 55 years ago (1962 - 07 - 02) Rogers, Arkansas, U.S. Founder Sam Walton Headquarters Bentonville, Arkansas, United States Number of locations 11,718 stores worldwide (January 31, 2018) Area served Worldwide Key people Greg Penner (Chairman) Doug McMillon (President & CEO) Products Electronics Movies and music Home and furniture Home improvement Clothing Footwear Jewelry Toys Health and beauty Pet supplies Sporting goods and fitness Auto Photo finishing Craft supplies Party supplies Grocery Services Walmart - 2 - Walmart Walmart MoneyCard Pickup Today Walmart.com Walmart Pay Revenue US $500.34 billion (2018) Operating income US $20.437 billion (2018) Net income US $9.862 billion (2018) Total assets US $204.52 billion (2018) Total equity US $77.869 billion (2018) Owner Walton family (51%) Number of employees 2.3 million, Worldwide (2017) 1.4 million, U.S. (2017) Divisions Walmart U.S. Walmart International Sam's Club Global eCommerce Subsidiaries Walmart Canada Walmart Mexico Walmart Chile Walmart de México y Centroamérica @ WalmartLabs Walmart Neighborhood Market Asda Amigo Supermarkets Vudu Massmart Seiyu Group Bompreço Líder Jet.com Hayneedle Moosejaw ModCloth Flipkart Website Corporate website Commercial website Footnotes / references
Document 11: Curtis-Shipley Farmstead: The Curtis—Shipley Farmstead is a historic home located at Ellicott City, Howard County, Maryland, United States. It is located on the first land grant in modern Howard County, then Anne Arundel County, to the English settler Adam Shipley in 1688 who settled properties in Maryland as early as 1675. The 500 acre estate was called "Adam the First".
Document 12: Faulkner, Maryland: Faulkner is an unincorporated community in Charles County, Maryland, United States. It is home to the Loyola Roman Catholic retreat center. Near here, John Wilkes Booth, assisted by Thomas A. Jones of Huckleberry Farm, was rowed across the Potomac River into Virginia, a week after he assassinated President Abraham Lincoln. The community was called Lothair before being renamed for a local resident.
Document 13: Sam's Club: As of January 31, 2018, Sam's Club operates 597 membership warehouse clubs in 44 U.S. states. Alaska, Massachusetts, Oregon, Rhode Island, Vermont, and Washington are the only states where Sam's Club does not operate, as is the case for the District of Columbia. Walmart International also operates Sam's Clubs in Mexico, Brazil, and China. It has 162 locations in Mexico, 27 locations in Brazil, and 19 in China. Locations generally range in size from 94,000 -- 161,000 sq ft (8,700 -- 15,000 m), with an average club size of approximately 134,000 sq ft (12,400 m).
Document 14: Talbot County District Courthouse: The District Court of Maryland for Talbot County District Courthouse is located in Easton, Maryland. Jurisdiction of the District Court includes most landlord- tenant cases, small claims for amounts up to $5,000, replevin
Document 15: History of Walmart: By 1988, Walmart was operating in 27 states, having expanded into Arizona, Michigan, Ohio, West Virginia, New Jersey, and Wyoming. By 1990, they expanded into California (which marked Walmart officially becoming a fully nationwide retailer), Nevada, North Dakota, Pennsylvania, South Dakota, and Utah. The Walmart Visitor's Center also opened this year on the site of Sam Walton's original store.
ground_truth: 1991
sub_queries: What is the name of the state where Elk Landing is located? Answer: Maryland
when did the first walmart open in Maryland Answer: 1991