<P> A structured playoff series began in 1969 , when both the National and American Leagues were reorganized into two divisions each , East and West . The two division winners within each league played each other in a best - of - five League Championship Series to determine who would advance to the World Series . In 1985 , the format changed to best - of - seven . </P>
<P> A structured playoff series began in 1969 , when both the National and American Leagues were reorganized into two divisions each , East and West . The two division winners within each league played each other in a best - of - five League Championship Series to determine who would advance to the World Series . In 1985 , the format changed to best - of - seven . </P>
how long has world series been 7 games
how long has world series been 7 games
1985
1985