Do you treat the left lane of the interstate as a fast lane?

Ca

While visiting my husbands family up north, we noticed that the whole time we were there people went the speed limit or below the speed limit in the left lane. We were both so confused since here in the south we treat the left lane as a fast lane and you’re likely to get plowed over if you’re going the speed limit or lower in the left lane.

Do other countries implement this as well?

Does all of America implement this, just not the state we were in? (Ohio 😂)

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