CREATE TABLE table_60151 ("Opposing Team" CLOB, "Against" FLOAT, "Date" CLOB, "Venue" CLOB, "Status" CLOB, "Report" CLOB)

What day was United States the opposing team?
SELECT "Date" FROM table_60151 WHERE "Opposing Team" = 'united states'
SELECT "Date" FROM "table_60151" WHERE "Opposing Team" = 'united states'