Canadian grain in the USA?


I have been researching the flour industry and grain shipping by rail.  Did Canadian grain ever make it to the mills of Minneapolis in the pre WW2 era?  My research seems to say NO.  American flour wasn't competitive in Canada because of tariffs and Canadian grain seems to have exported to the UK or gone to mills in Eastern Canada .Does anyone have different information on this subject?  Thanks.

Richard Stallworth

Join to automatically receive all group messages.