a website (e.g. olivegarden.com) automatically redirects to the country-specific website

If they insist on serving country–specific sites without being able to override that, and you can work around it using VPN, than that's it. Other options would be getting a mobile data plan from another country and connecting using that, or using a proxy that's in that country. Some less stubborn ones might just be inferring the version served from your content localization preference for your convenience, see [[Choose display languages for multilingual web pages]] how that translates into requests — so as far as browser configuration comes into play, you can signalize preference for en-US content instead of en-CA if that's in your list.