Citrus From Canada? Really??? Lesson In Economics I Guess.

Going to be over 100F here in SoCal for the next few days so I thought I'd mix up a batch of lemonade to help rehydrate while doing yardwork. Just for kicks and giggles I checked out the label of the frozen lemonade concentrate I buy from Trader Joe's.
After finding out there's 27grams of "liquid invert sugars" (whatever they are) in every 8 ounces of finished lemonade, I saw a statement saying "country of origin on end of can". Expecting to see maybe Mexico or another warm climate country, since this in lemonade after all, I was shocked to see "Product of Canada".
Turns out the lemon juice concentrate, and probably also the lemon pulp and lemon oil are exported from the USA to Canada for mixing (with the sugars and Canadian water?), packaged and then imported back into the USA.
This is the most economical way to make and market frozen lemonade concentrate?
Really?