MLB includes one of the significant expert activities categories of the U. s. Declares and North the united states and the united states. It is created up of 30 categories, 29 in the U. s. Declares and one in North the united states and the united states. Groups in MLB perform 162 activities each year over six months (April through September). Five categories in each group advance to a four-round postseason opponents that completes in the World Sequence, a best-of-seven-games competitors series between the two group winners that plans to 1903.