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Originally Posted by BorealLynx
How did the Americans decide to make the Interstate thing happen at a federal level? They're one of the last countries on earth to embrace some degree of universal healthcare, so how were they bought in to the idea of a super-expensive federally-funded national highways system?
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The aftermath of World War II is one of the main reasons. The Federal-Aid Act of 1956 created a fund that enabled most interstates to be built, with 90% of funds provided by the federal government and 10% by the states. It was mostly done under the optics of enabling better transportation and economic growth across the entire US, but being able to move soldiers quickly throughout the US in the event of an invasion was also one of the reasons cited by the US government. Wikipedia says a a cross-country journey that would have taken 2 months in 1919 would now take 4 days upon completion of the interstate system.
While I doubt adding interchanges to the TransCanada highway or twinning it in certain sections would change any military outcome in the event of an invasion from Russia, China, or the US, there certainly is a safety aspect that needs to be considered.
However, in normal times, most economic trade in Canada is north-south, not east-west, and trips that are east-west can often rely on better, alternative routes through the US at no additional cost, so it makes the business case for upgrading the entire TransCanada to "interstate standards" a bit more challenging.