The "Mazda CX-30 Will Be Made In Mexico For Global Markets," at the same plant that builds the all-new Mazda3 sedan.
Mexico is where Mazda produces a lot of its higher volume selling vehicles for the better profit margins, specifically with trade. Mexico has a free-trade agreement with numerous key world markets like Europe, Canada and the U.S., to name a few.
A massive production capacity of 250,000 units a year also helps.
Mexico is also where many other automakers have move production to in recent years for similar reasons.