time for amercian is a big issue... So one year program is popular in the Unites State.. For a american, he proprably won't want to spend extra two years to get a master still having a education loan... even for me, i would like to attend a one year program, since i can get out of school earily to find a job...
So that why master progarm in the Unites State is often very shotly, and intensive...