Question: What country does Shermans Dale, Pennsylvania and Scotch-Irish Americans have in common?

Context articles: West Perry High School
Little Buffalo Historic District
Scottish Americans
Pennsylvania Route 850
Green Park, Pennsylvania
Scotch-Irish Americans
Shermans Dale, Pennsylvania
Sodom Schoolhouse
Conococheague Mountain Tunnel
Newport and Shermans Valley Railroad

West Perry High School is a small, rural public high school located at 2608 Shermans Valley Road, Elliottsburg, Pennsylvania.
 The School is the only high school operated by the West Perry School District.
 In 2016, enrollment was reported as 811 pupils in 9th through 12th grades, with 30.8% of pupils eligible for a free lunch due to family poverty.
 Additionally, 16% of pupils received special education services, while 3.9% of pupils were identified as gifted.
 In 2015 enrollment was reported at 800 pupils.
 In 2014, enrollment was reported as 802 pupils in 9th through 12th grades, with 32.79% of pupils eligible for a free lunch due to family poverty.
Little Buffalo Historic District, is a national historic district in Centre Township and Juniata Township near Newport, Perry County, Pennsylvania, United States.
 It comprises a number of sites and structures which date from the iron-making era prior to 1850 when the settlement was known as Juniata Furnace.
 These include the remains of the iron furnace complex, Superintendent's House (1861), cemetery, first and second levels of the Blue Ball Tavern, covered bridge known as Wahneta's of Clay's Bridge, and the hiking trail that was once the bed of the Newport and Shermans Valley Railroad.
Scottish Americans or Scots Americans (Scottish Gaelic: "Ameireaganaich Albannach"; Scots: "Scots-American" ) are Americans whose ancestry originates wholly or partly in Scotland.
 Scottish Americans are closely related to Scotch-Irish Americans, descendants of Ulster Scots, and communities emphasize and celebrate a common heritage.
 The majority of Scotch-Irish Americans originally came from Lowland Scotland and Northern England before migrating to the province of Ulster in Ireland (see "Plantation of Ulster") and thence, beginning about five generations later, to North America in large numbers during the eighteenth century.
Pennsylvania Route 850 (PA 850) is a 44 mi state highway located in Juniata and Perry Counties in Pennsylvania.
 The western terminus is at PA 35 in Tuscarora Township.
 The eastern terminus is at US 11/US 15 in Marysville.
 PA 850 is a two-lane undivided road that runs through rural areas in the Ridge-and-Valley Appalachians.
 The route heads southeast from PA 35 and crosses PA 75 in Honey Grove before it traverses Tuscarora Mountain and leaves Juniata County for Perry County.
 PA 850 continues southeast and crosses PA 17 in Kistler before running east concurrent with PA 274 between Fort Robinson and Loysville.
 The route turns back to the southeast and heads south concurrent with PA 233 into Landisburg.
 PA 850 heads east, crossing PA 74 in Alinda before following PA 34 southeast between Dromgold and Shermans Dale.
 From here, the route continues east to its terminus in Marysville.
 PA 850 was designated in 1928 to run from PA 274 in Fort Robinson northwest to Kistler, with the road between Landisburg and Dromgold designated as part of PA 233.
 In the 1930s, the route was extended to its current length between PA 35 in Tuscarora Township and PA 14 (now US 11/US 15) in Marysville, replacing the portion of PA 233 between Landisburg and Dromgold.
Green Park, an incorporated village located in northeastern Tyrone Township, Perry County, Pennsylvania, sits at the intersection of Pennsylvania Route 233 (Green Park Road) and Pennsylvania Route 274 (Shermans Valley Road).
 Named after popular 1800s picnic grounds located in the vicinity (at the upper end of Stambaugh Farm Run), the town serves as Perry County’s midpoint between the Conococheague Mountain in the west and the Susquehanna River to the east.
 Given its central location, connection to a once-thriving wheelwright industry, and historic schoolhouse, Green Park has unofficially been nicknamed Perry County's "Hub of Education."
Scotch-Irish (or Scots-Irish) Americans are American descendants of Presbyterian and other Ulster Protestant Dissenters from various parts of Ireland, but usually from the province of Ulster, who migrated to North America during the 18th and 19th centuries.
 While an estimated 36 million Americans (12% of the total population) reported Irish ancestry in 2006, and 6 million (2% of the population) reported Scottish ancestry, an additional 5.4 million (1.8% of the population) identified more specifically with Scotch-Irish ancestry.
 The term "Scotch-Irish" is used primarily in the United States, with people in Great Britain or Ireland who are of a similar ancestry identifying as Ulster Scots people.
 Most of these emigres from Ireland had been recent settlers, or the descendants of settlers, from the Kingdom of England or the Kingdom of Scotland who had gone to Ireland to seek economic opportunities and freedom from the control of the episcopal Church of England and the Scottish Episcopal Church.
 These included 200,000 Scottish Presbyterians who settled in Ireland between 1608-1697.
 Many English-born settlers of this period were also Presbyterians, although the denomination is today most strongly identified with Scotland.
 When King Charles I attempted to force these Presbyterians into the Church of England in the 1630s, many chose to re-emigrate to North America where religious liberty was greater.
 Later attempts to force the Church of England's control over dissident Protestants in Ireland were to lead to further waves of emigration to the trans-Atlantic colonies.
Shermans Dale is an unincorporated community in Carroll Township, Perry County, Pennsylvania, United States, along Sherman's Creek.
 It was originally settled by Scots-Irish settlers before the American Revolutionary War.
 Its ZIP code is 17090.
Sodom Schoolhouse is a historic octagonal school in West Chillisquaque Township, Northumberland County, Pennsylvania, United States reportedly built about 1812, 1835, or 1836 and used until 1915.
 It is located in a rural area on Pennsylvania Route 45 near several Scotch-Irish communities: the "small group of houses" formerly known as Sodom, which was about a mile east of the hamlet of Montandon, and about 3 miles east of a small town, Lewisburg.
The Conococheague Mountain Tunnel was a proposed railroad tunnel in Perry County, Pennsylvania.
 It was originally planned as part of the Path Valley Railroad, with the intent to link the Newport and Shermans Valley Railroad with the East Broad Top Railroad and the Tuscarora Valley Railroad further west.
 Only about 100 feet of either end of the planned 2600 foot tunnel was completed in 1894.
The Newport and Shermans Valley Railroad was a nineteenth-century, narrow gauge railroad in Pennsylvania.
 It ran from Newport, Pennsylvania to New Germantown, Pennsylvania.
 It carried lumber, and transferred it to the Pennsylvania Railroad at Newport.
 The right of way was extended to an uncompleted tunnel through Conococheague Mountain, started in an attempt to connect with the Path Valley Railroad.
 This right of way was later used by the Perry Lumber Railroad.