Since the 4x100 medley relay was introduced as an event at the 1960 Rome Olympics, the United States has won gold every year in which it has competed. (Australia won gold at the 1980 Olympics boycotted by the United States.)
The United States' ability to produce swimmers dominant in each of the four strokes has given it a huge edge over other nations. Though other countries have often been able to finish within a second or two of the U.S., no one has yet been able to finish the job against Team USA.
While the U.S. 4x100 medley relay team will no doubt be an impressive collection of swimmers, it's fun to imagine an all-time "dream team" of the best American swimmers in each stroke. Here is what such a team would almost certainly look like.