CREATE TABLE table_73564 ("Order number" TEXT, "Build date" TEXT, "Serial numbers" TEXT, "Country" TEXT, "Railroad" TEXT, "Numbers" TEXT, "Quantity" FLOAT)

What country has the order number 711871-711880?
SELECT "Country" FROM table_73564 WHERE "Order number" = '711871-711880'
SELECT "Country" FROM "table_73564" WHERE "Order number" = '711871-711880'