CREATE TABLE table_name_4 (year_s__won VARCHAR2, country VARCHAR2, total VARCHAR2)

What year did the United States win with a total of 278?
SELECT year_s__won FROM table_name_4 WHERE country = "united states" AND total = 278
SELECT "year_s__won" FROM "table_name_4" WHERE "country" = "united states" AND "total" = 278