CREATE TABLE table_48197 ("Player" TEXT, "Nationality" TEXT, "Jersey Number ( s ) " FLOAT, "Position" TEXT, "Years" TEXT, "From" TEXT)

What is Years, when Nationality is United States, and when Position is PG / SG?
SELECT "Years" FROM table_48197 WHERE "Nationality" = 'united states' AND "Position" = 'pg / sg'
SELECT "Years" FROM "table_48197" WHERE "Nationality" = 'united states' AND "Position" = 'pg / sg'