I want to know the answer to the following question:
What was Roper's position?
All the background I'm provided with is that "On 19 May, George VI personally accepted and approved the Letter of Credence of the new U.S. Ambassador to Canada, Daniel Calhoun Roper; gave Royal Assent to nine parliamentary bills; and ratified two international treaties with the Great Seal of Canada.". Is that enough to answer the question?
Answer: yes