Structurally I don’t see a requirement to move production closer to the biggest market. The supply chain and the logistics are as efficient as it gets now. Perhaps in the future there will be something needed to have the manufacturing close, customization or the next step in manufacturing that they wish to keep tighter control over.
Most likely however they are moving the manufacturing/assembly to the US to counter the storm of criticism that started last year.
Either way, it is a great thing to see. Hopefully will re-spawn all of the part supply companies as well.