We only source internationally from natural wine regions in order to avoid pesticide exposure commonly found here in the states.
The reason why American organic commercial wine is not the best is simple: the modern wine industrial complex is just too big. Some studies have shown that up to 100% of organic wines produced in the US test positive for pesticides and/or herbicides such as glyphosate.
So even when grapes are planted organically, they can be contaminated from soil runoff, rain, and wind from neighboring vineyards. Unfortunately, the large size of the industrial winemakers in the US touches every corner of the wine market and makes it very difficult to find truly organic wine.