Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_48043 ( "Round" real, "Pick" text, "Player" text, "Position" text, "Nationality" text, "Club Team" text )

### Question ###
Which Round has a Nationality of united states, and a Player of jimmy hayes?

### Accurate SQL ###

SELECT MAX("Round") FROM table_48043 WHERE "Nationality" = 'united states' AND "Player" = 'jimmy hayes'