What is the highest population (2008) created earlier than 1857, and the county was Sinoe?
CREATE TABLE "counties_and_districts" (
  "mapnum" real,
  "county" text,
  "capital" text,
  "population_2008" real,
  "area" text,
  "created" real
);
SELECT MAX("population_2008") FROM "counties_and_districts" WHERE "created"<1857 AND "county"='sinoe';