Based on the clue '21 or a thugs bludgeon', what is the answer?

What is referred to by '21 23 27'? Based on the clue '21 bible books are this type of letter intended fo...', what is the answer? Based on the clue '21 million americans have this disease of the endo...', what is the answer? Based on the clue '21 of the area of this country whose name is spani...', what is the answer? Based on the clue '21 year old justin huish of simi valley was right ...', what is the answer? Based on the clue '21 years after developing an improved electric lig...', what is the answer? Based on the clue '210 parkside drive west branch iowa', what is the answer? What is associated with: 2160 people at a time could ride on this at the 1893 chicago worlds fair?