premise: Prince Hall Freemasonry is a branch of North American Freemasonry founded by Prince Hall on September 29, 1784 and composed predominantly of African Americans. There are two main branches of Prince Hall Freemasonry: the independent State Prince Hall Grand Lodges, most of which are recognized by Regular Masonic jurisdictions and those under the jurisdiction of the National Grand Lodge.
hypothesis: North American Freemasonry has only two main branches. 
reason: The statement provided only speaks of two main branches. No other branches are listed. According to the statement provided, what I wrote is correct. 