Answer: I'm going to be a writer like Ring Lardner or somebody -- that's if things don't work out first with the Yankees, or the Cubs, or the Red Sox, or maybe possibly the Tigers... If I get down to the St. Louis Browns, then I'll definitely be a writer.
Step-by-step explanation:
The line from Brighton Beach Memoirs that help the audience understand the historical setting is "I'm going to be a writer like Ring Lardner or somebody -- that's if things don't work out first with the Yankees, or the Cubs, or the Red Sox, or maybe possibly the Tigers... If I get down to the St. Louis Browns, then I'll definitely be a writer".
It should be noted that the historical setting helps us to know what a story entails and also understand the story's context. It makes us know the motivations behind the actions of some characters with regards to the story.