'Boxplot for one element instead of all of them

install.packages("HSAUR")
data("Forbes2000", package="HSAUR")  
boxplot((log(Forbes2000$marketvalue)~Forbes2000$country))

I get the boxplot for each and every country, is there a way for me to get it for only one desired country? For example the united states (which is indexed 1 in forbes2000$country) .Here's how the code runs. . I want the highlighted part. I tried doing this :

boxplot((log(Forbes2000$marketvalue[1])~Forbes2000$country[1]))

but it's incorrect.

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'Boxplot for one element instead of all of them

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