Tom MacWood,
Why did Stanley Thompson do so little work in the States?
(Post war) 1920-1929 was a period of massive growth of Canadian golf. He was very, very busy, and likely didn't have much time or need to push into other countries. When you look at how much work he did including Banff, Jaspar and St. George's, etc. ; he didn't have much time
(Market crash) 1929-1932
The crash was in 29' but the low point of the crash was actually in the year after. The economy of the US and Canada was depressed for quite a few years out. I seem to remember reading that in the mid thirties drought devestated Canada as well.
1932-1935
Jones joins Thompson and they come up with the idea of building golf through government grants. Thompson takes Canada (Highland Links is a project borne from government money), and Jones takes all work in the US. That was there agreement.
1936 approx.
Jones leaves Thompson around or during the birth of Capilano. Stanley does some abroad, but his career slows down dramatically due with the coming of war.
1939-45
The war effects all of golf. He has also bought Cutten Club and plays fairly regularly golf, while working much less.
1945 to his death
He works much less because of a combination of health problems and limited opportunity. I have talked to a couple of people wh knew him at this time and they said that his heavy drinking had caught up to him and he struggled by mid day most days. His last driver/shaper also was in the process of consuming himself to death too. Most of the people around him like his nephew (not the brother) took other jobs as golf superintendents with the work drying up and Thompson's health quickly failing.
So why didn't he work more in the US?
-didn't need the work
-the war effected him at key points in his career
-an agreement with Trent at a key moment
-he was Canadian and not Scotish
People hired Scotish architects and golf pros only in this time. Bill MacWilliam told me about his father changing his name from an Irish McWillian to MacWilliam to ensure he got the job at St. Andrew's (NLE - S. Thompson) in Toronto. Stanley has often told people he was Scottish in order to get work, even though he was clearly born in Toronto.
Hope this helps explain the circumstance that had an influence, as opposed to direct facts or examples which I can not offer.