Question: when did the first Walmart open in the state Bullfrog Road Bridge is located?

full_context: Document 1: Bridge between Monroe and Penn Townships: The Bridge between Monroe and Penn Townships, also known as the Penns Creek Bridge, Camelback Bridge, or Camelback, was a historic bridge located at Monroe Township and Penn Township near Selinsgrove in Snyder County, Pennsylvania. It was a barrel arch bridge built in 1919. It spanned Penns Creek. It was removed in 1994.
Document 2: 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 3: County Bridge No. 101: County Bridge No. 101 is a historic stone arch bridge located in Valley Township, Chester County, Pennsylvania. It spans Brandywine Creek. It has four stilted arch spans, each of which are 40-feet long. The bridge was constructed in 1918.
Document 4: 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.
Document 5: Emlenton Low Level Bridge: The Emlenton Low Level Bridge is a girder bridge that spans the Allegheny River at Emlenton in the U.S state of Pennsylvania. It connects two separate portions of the borough in Venango and Clarion counties. It replaced, an 1883 truss bridge that stood just upstream, which replaced several previous wooden structures; the modern bridge was constructed in 1987. This bridge is dwarfed by its more famous nearby cousin, the 1968 Emlenton Bridge along Interstate 80.
Document 6: 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 7: Weaverland Bridge: Weaverland Bridge carries Quarry Road (Township Route 894) across the Conestoga River near Terre Hill, East Earl Township, Lancaster County, Pennsylvania, in the United States. The bridge is notable for its form, a concrete bowstring arch truss. Designer Frank H. Shaw was a consulting engineer to Lancaster County when the bridge was constructed in 1916. Weaverland Bridge was determined to be eligible for the National Register of Historic Places in 1993.
Document 8: Bullfrog Road Bridge: The Bullfrog Road Bridge is a historic bridge between Emmitsburg, Frederick County and Taneytown, Carroll County in Maryland. The bridge crosses the Monocacy River on Bullfrog Road between the two counties. This bridge is a rare steel Parker through truss structure and is 183 feet in length and 16 feet-5 inches in width. It was built in 1908, by the York Bridge Company of York, Pennsylvania.
Document 9: 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 10: Old Mill Road Bridge: The Old Mill Road Bridge is a historic bridge near Rocky Ridge, Frederick County, Maryland, United States. The bridge spans Owens Creek southwest of Rocky Ridge on Old Mill Road. It is a Pratt half-hip through truss structure in a single span long and . It was built in 1882 by the Pittsburgh Bridge Company, Pittsburgh, Pennsylvania.
Document 11: 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 12: 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 13: Green Bay Road Bridge: The Green Bay Road Bridge is a Pratt pony truss bridge across the Manitowoc River in Manitowoc Rapids. The bridge was built in 1887 by the Wisconsin Bridge and Iron Company and was the second river crossing built at its location. Originally a road bridge, the bridge is now used for a bicycle and walking trail; it is in good condition and is considered a historically significant example of a pony truss road bridge. The bridge was added to the National Register of Historic Places on August 3, 1998.
Document 14: 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 15: Emlenton Bridge: An interesting fact about the Emlenton Bridge is that due to its size, and geography of the land, is actually located in three different Pennsylvania counties. One side of the bridge is in Venango County, the other in Clarion County, but the southwest abutment resides in Butler County.
ground_truth: 1991
sub_queries: In which state is Bullfrog Road Bridge located? Answer: Maryland
when did the first walmart open in Maryland Answer: 1991