CREATE TABLE table_203_102 (id DECIMAL, "event" TEXT, "performance" TEXT, "athlete" TEXT, "nation" TEXT, "place" TEXT, "date" TEXT)

what country 's 200 m was the quickest ?
SELECT "nation" FROM table_203_102 WHERE "event" = '200 m'
SELECT "nation" FROM "table_203_102" WHERE "event" = '200 m'