"What role, if any, do you think the R&A played in the conflits of the WGA and USGA. Perhaps a unity with not only the Rules of Golf but the R&A stacked the cards in favor of the USGA?"
PatC:
That is actually a very good question along about this time and probably an appropriate one as many today may look at the R&A back then during the beginnings of golf in America as perhaps something of a dominating or autocratic organization itself, particularly in the context of the beginnings of the USGA itself.
Personally, I do not believe it was anything of the kind, perhaps quite the opposite. The R&A at St Andrews was actually something of an unwilling participant in the early 1890s to be the organization to run and administer the Rules of Golf globally or even within GB. The records show they had to be constantly encouraged and persuaded at that time to take on that roll. But when they did agree they agreed to act simply as advisors on Rules and such only if other clubs chose to follow the Rules of The Royal and Ancient GC of St. Andrews itself.
I think it was Macdonald himself who was by far and away the biggest promoter that the USGA and American golf should follow the R&A's Rules and maintain unification with them and he was on the Rules Committee of both the USGA and R&A.
I believe it constantly concerned Macdonald, particularly early on, that American golf either via the USGA or the WGA were always thinking of striking out on their own with their own Rules and essentially creating another and somewhat different game from abroad and the R&A.
Issues such as the famous Schnectedy Putter incident (Travis 1904) that lasted for a number of years (in the context of a Rules decision) certainly didn't help with easy unity between America and abroad and between the R&A and USGA. The Schnectedy Putter incident got so hot and so "national" that the president of the United States even eventually weighed in on it for Christ's Sake!