; and (C) in August 2017, many Gulf Coast refineries and petrochemical facilities shut down, which affected 54 percent of United States ethylene production and 36 percent of United States ethylene consumption capacity; (4) there are economic efficiencies and economic security benefits to maintaining all elements of the value chain for ethane and other natural gas liquids in clusters in various geographical regions, provided each cluster includes natural gas production, natural gas processing plants, natural gas liquids fractionation plants, natural gas liquids transportation infrastructure, natural gas liquids storage, and ethane and other natural gas liquids petrochemical infrastructure; (5) there are economic efficiencies to building ethane and other natural-gas-liquids-related petrochemical infrastructure, including storage and distribution systems, within the Appalachian region, because of the close proximity of the region to the industrial Midwest and manufacturers in the Eastern United States that use petrochemicals, such as plastic resins, as manufacturing inputs; and (6) it is a priority of the United States to minimize effects of volatility in any individual market by maintaining— (A) a robust domestic natural gas liquids resource base; (B) the requisite physical assets along the value chain for ethane and other natural gas liquids