121135
The company primarily operated during the 1980s and 1990s throughout the Midwestern United States , and is considered among the first national chains to implement the DIY strategy .
 Midwestern United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Midwestern United States