Why Washington opposed Canadian nuclear submarines

Why did the United States oppose Canadian nuclear submarines during the Cold War?

The proposed explanation is fear of greater Canadian independence. A guest also suggests national ego, while explicitly disclaiming knowledge of the specific decision.

The proposed explanation is a fear that nuclear submarines would make Canada too independent. A guest adds an interpretation based on the politics of the 1980s: national ego. That guest explicitly disclaims knowledge of the particular decision. The autonomy and ego explanations therefore remain political judgments, without a documented reconstruction of American decision-making.