CREATE TABLE table_71881 ("Representative" TEXT, "Title" TEXT, "Presentation of Credentials" TEXT, "Termination of Mission" TEXT, "Appointed by" TEXT)

What is the title of the representative appointed by James K. Polk?
SELECT "Title" FROM table_71881 WHERE "Appointed by" = 'james k. polk'
SELECT "Title" FROM "table_71881" WHERE "Appointed by" = 'james k. polk'