If by the best you mean which country has the largest production of Pistachio nuts, the sales of tons as of 2005:
Iran: 190,000 tons.
United States: 140,000 tons.
Please see related link below!
Oct 9, 2008 ... thought: the United States may oust Iran as the world's largest producer of pistachio nuts this year because of one of the worst harvests.
www.reuters.com/article/newsOne/idUSTRE49806E20081009
Iran, the US, Syria, Turkey, and the European Union.
Georgia USA uses produces lots of peanuts...look it up on Google and on google images the states that produce peanuts will be highlighted
In 2009, California produced 386 million pounds of pistachios from a total area of 126,000 acres, making it the nation's top producer.
u.s.
California.
iran
California
In Europe, Poland produces the most coal.
New Zealand.
venazuela
russia
India
Columbia
China
India
Iran
China produces the most silicon, at about 2/3 of the world's utilization.
Brazil is such country.
China is the leading country in the world who produces the most pork in the world.