CREATE TABLE table_23906 ("School" TEXT, "Location ( s ) " TEXT, "Control" TEXT, "Type" TEXT, "Accreditation" TEXT, "Founded" TEXT, "Enrollment" TEXT)

What is the control type which was founded in 1818?
SELECT "Control" FROM table_23906 WHERE "Founded" = '1818'
SELECT "Control" FROM "table_23906" WHERE "Founded" = '1818'