text: The National Hockey League ( NHL ) has undergone several rounds of expansion and other organizational changes during its nearly 100-year history to reach its current number of thirty teams : twenty-four in the United States , and six in Canada .
simplified: The National Hockey League ( NHL ) has gone through many rounds of expansion and other organizational changes during its nearly 100-year history to reach its current number of thirty teams : twenty-four in the United States , and six in Canada .