While both of your terms would also be correct major force is also correct as established in the citations  For your edification lets take a look at the definition of major force according to Websters  Major very important notable or conspicuous in effect or scope Force an individual or group having the power of effective action  most appropriate definitions per this usage  Those would be a more accurate description of Havers influence as per the source  I would suggest that you reflect on your edits based on your opinion without any backup before you continue your pattern of subjective editing You provide subjective opinion I cite sources and give clear references I have reverted your subjective edit which you base solely on your opinion  Might I further suggest that we let other editors weigh in so that a consensus can be reached which is proper Wikipedia policy