While both of your terms would also be correct major force is also correct as established in the citations For your edification let s take a look at the definition of major force according to Webster s 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 Haver s influence as per the source I would suggest that you reflect on your edits based on your opinion without any back up 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