The US already had good air defense, and it heavily involves Canada. North American air defense is integrated.
No technological solution for alienating America's biggest neighbor and throwing away the trust, access, intel sharing, and forward positioning the mutually-beneficial alliance provided.
No technological solution for alienating America's biggest neighbor and throwing away the trust, access, intel sharing, and forward positioning the mutually-beneficial alliance provided.
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We literally tried this under Reagan it was as stupid then as it is now.
https://www.cbc.ca/news/canada/spy-balloon-canada-norad-questions-1.6742695