CREATE TABLE table_78289 ("Disaster" CLOB, "Year" CLOB, "Countries Affected" CLOB, "Scale of Disaster" CLOB, "People Assisted" CLOB, "Nature of Help" CLOB)

What is the scale of disaster for the USA?
SELECT "Scale of Disaster" FROM table_78289 WHERE "Countries Affected" = 'usa'
SELECT "Scale of Disaster" FROM "table_78289" WHERE "Countries Affected" = 'usa'