How many times has the US won the Ryder Cup?

the US has won 4 times and has tie once; since the conception of the Ryder cup USA has won 25 of 39 times.

Originally contested between Great Britain and the United States, the first official Ryder Cup took place in 1927 at Worcester Country Club, in Massachusetts, US. The home team won the first five contests, but with the competition's resumption after the Second World War, repeated American dominance eventually led to a decision to extend the representation of "Great Britain and Ireland" to include continental Europe from 1979.