Getting a vector containing total observations

I have a data frame that contains a column of city names that can be repeated:

City <- c("Raleigh", "Charlotte", "Greensboro", "Boone", "Boone", "Charlotte", "Cary")

I would like to create a vector that has only the city names without repetition, like the following:

[1] "Raleigh" , "Charlotte", "Greensboro", "Boone", "Cary"

Is there a function in R that does this?

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