Question: Pathmark was started when a member broke away from a retailer's cooperative based in what city?

Context paragraphs:
Northern Plains Electric Cooperative: Northern Plains Electric Cooperative is a public utility cooperative based in Carrington and Cando, North Dakota.  It serves as the electric distribution utility in a portion of east central North Dakota.  It receives power from the Central Power Electric Cooperative.  Northern Plains is the largest cooperative in ND land-wise and was created in 1997 from the merger of Baker Electric Cooperative (based in Cando; previously a member of Minnkota Power Cooperative) and Tri-County Electric Cooperative (based in Carrington).  In 2005, Northern Plains entered into a resource-sharing agreement with the Dakota Valley Rural Electric Cooperative that allows them to function as one large cooperative while continuing as two separate companies.

Pathmark: Pathmark was a supermarket chain in the Northeastern United States.  The chain was started in 1968 when a member of the ShopRite retailer's cooperative broke away to go into business for itself.  Pathmark stores were liquidated and closed in 2015 following the bankruptcy of its parent company The Great Atlantic and Pacific Tea Company.  The intellectual assets and brand name were acquired by Allegiance Retail Services during A&P's bankruptcy in 2016 for $1 million.

ShopRite (United States): ShopRite Supermarkets (formerly Shop-Rite and Shop Rite) is a retailers' cooperative (co-op) of supermarkets in the northeastern United States, with stores in New Jersey, New York, Connecticut, Delaware, Maryland, and Pennsylvania.  Based in Keasbey, New Jersey, ShopRite consists of 48 individually owned-and-operated affiliates with over 296 stores, all under its corporate and distribution arm, Wakefern Food Corporation.  Wakefern itself owns and operates 33 of the locations through subsidiary ShopRite Supermarkets, and is the largest affiliate in the cooperative.  Several Wakefern members own and operate single ShopRite stores, while most own multiple locations.  The average Wakefern member operates 6 stores.

Dakota Valley Electric Cooperative: Dakota Valley Electric Cooperative is a public utility cooperative based in Milnor and Edgeley, North Dakota.  It serves as the electric distribution utility in a portion of southeast North Dakota.  It receives power from the Central Power Electric Cooperative.  Dakota Valley was formed by a merger of the former James Valley Electric Cooperative based in Edgeley and the former RSR Electric Cooperative based in Milnor.  In 2005, Dakota Valley entered into a resource-sharing agreement with the Northern Plains Electric Cooperative that allows them to function as one large cooperative while remaining as two separate companies.

Grange Cooperative: Grange Cooperative Supply Association (often displayed as Grange Co-op) is an agricultural supply cooperative based in Oregon's Rogue Valley.  The Cooperative was started in 1934 with a group of 99 farmers from the Rogue Valley who invested $10 each to form a fuel-delivering cooperative in Central Point, Oregon.  Grange Co-op was limited to petroleum supplies at first.  Today the company offers high-quality agricultural supplies, farm products, consumer goods, petroleum products, pet supplies, lawn and garden supplies, apparel, footwear and hardware.

Wilco (farm supply cooperative): Wilco is a farm supply cooperative based in the Willamette Valley of the U.S. state of Oregon.  It was started in 1967 with a merger of the Mt. Angel Farmers Union Warehouse, the Santiam Farmers Cooperative, the Donald Farmers Co-op, the Valley Farmers co-op in Silverton, and the Canby Cooperative.  The name "Wilco" comes from a shortening of "Willamette Consolidated".  The cooperative's headquarters are in Mt. Angel.

Basin Electric Power Cooperative: Basin Electric Power Cooperative is a wholesale electric generation and transmission cooperative based in North Dakota that provides electricity to 2.8 million customers in nine U.S. states.  The roots of the cooperative go back to 1960 when Leland Olds and ten power suppliers created Giant Power Cooperative.  Giant Power was first going to be a generation and transmission cooperative, but to keep electricity cheaper for rural customers, Basin Electric Power Cooperative was started in 1961.  Today, Basin Electric's power sources include coal, natural gas, the wind, waste heat, and nuclear.  The current CEO and General Manager is Paul Sukut.  A subsidiary of Basin Electric, Dakota Gasification Company, operates the Great Plains Synfuels Plant, which captures and sequesters nearly 50% of its carbon dioxide emissions in a system developed during the Carter administration.  In 2005, the membership of Basin Electric passed a resolution requiring 10 percent of electricity demand to be provided by renewable forms of energy.  At the end of 2009, Basin Electric finished construction on a 77 turbine wind energy project.

United Movement for Democratic Change: United Movement for Democratic Change is a Zimbabwean political party founded in November 2014 as a merger of two parties descended from the Movement for Democratic Change (MDC): the Movement for Democratic Change – Ncube (MDC-N) headed by Welshman Ncube, which broke away from MDC in 2005, and the MDC Renewal Team led by Tendai Biti, which broke away from Movement for Democratic Change – Tsvangirai in 2014 in protest against what they saw as the ineffectual leadership and increasingly authoritarian tendencies of party chairman Morgan Tsvangirai.  The party is intended as the core of a united opposition movement in Zimbabwe and is jointly led by Ncube and Sekai Holland.  It aimed to hold a formative party congress in August 2015 to agree on a manifesto.  The party has 17 MPs (15 from MDC Renewal Team and 2 from MDC-N) and 2 Senators (both former Renewal Team members) making it the third strongest parliamentary party in Zimbabwe.

Mor-Gran-Sou Electric Cooperative: Mor-Gran-Sou Electric Cooperative, Inc. is a public utility cooperative based in Flasher, North Dakota.  It serves as one of the electric distribution utilities in south central North Dakota, primarily serving Morton, Grant and Sioux Counties.  Mandan is the largest city in its service area, but Flasher is the largest town served by the cooperative.  Mor-Gran-Sou Electric is a member of and receives power from Basin Electric Power Cooperative.  Mor-Gran-Sou also purchases hydroelectric power from the federal Western Area Power Administration.

Sikkim Ekta Manch: Sikkim Ekta Manch (Sikkim Unity Platform), was a political party in the Indian state of Sikkim.  SEM was founded in August 1997, when L.P. Tiwari and T.M. Rai broke away from the Indian National Congress.  Shortly thereafter Rai broke away from SEM to form Sikkim Janashakti Party.  In November 1998 SEM merged with INC.

Supporting paragraphs: Pathmark ShopRite (United States)
Answer: Keasbey