63892
The development made short-staple cotton profitable and opened the upland Piedmont region to slave-based cotton plantations , previously restricted to the Sea Islands and Lowcountry .
 Piedmont, Sea Islands, Lowcountry
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Piedmont, Sea Islands, Lowcountry