question: As of 2010, how many people lived in the region in which Robert Sheffey was a preacher to?
answer: 25 million people
context: Title: Sharpsburg, Pennsylvania
  Passage: Sharpsburg is a borough in Allegheny County, Pennsylvania, 5 mi northeast of downtown Pittsburgh, along the Allegheny River.  In the past, it had a rolling mill, foundries, machine shops, and manufacturers of varnish, brick, glass, lumber products, wire, hair, felt, and lubricating oil.  In 1900, 6,842 people lived here; by 1940, 8,202 people lived in Sharpsburg.  The population was 3,446 at the 2010 census.
  Title: Appalachia
  Passage: Appalachia ( ) is a cultural region in the Eastern United States that stretches from the Southern Tier of New York to northern Alabama, Mississippi and Georgia.  While the Appalachian Mountains stretch from Belle Isle (Newfoundland and Labrador) in Canada to Cheaha Mountain in Alabama, the cultural region of Appalachia typically refers only to the central and southern portions of the range.  As of the 2010 United States Census, the region was home to approximately 25 million people.
  Title: Robert Sheffey
  Passage: Robert Sayers Sheffey (July 4, 1820 – August 30, 1902) was a Methodist evangelist and circuit-riding preacher, renowned for his eccentricities and power in prayer, who ministered to, and became part of the folklore of, the Appalachian region of southwest Virginia, southern West Virginia and eastern Tennessee.
  Title: List of Ottoman people
  Passage: List of Ottoman people refers to people lived in the Ottoman Empire (1299-1922).  Naturally, some people lived in the last years of the empire also lived in the early years of Turkey or other countries controlled by the Ottoman Empire.
citations: Appalachia Robert Sheffey