Task: Question Decomposition
Input (English): question: What event happened first, new forts being built, or measures being taken to undermine the traditional clan system?
Output (English): #1 return new forts being built 
#2 return measures being taken to undermine the  traditional clan system 
#3 return when  was  #1 
#4 return when  was  #2 
#5 return which is the  lowest of #3 ,  #4