The term United States domestic market (USDM) is an unofficial term used chiefly by automotive enthusiasts to describe the United States' economic market for American brand automobiles and parts.
The term is also applied to vehicles that comply with United States regulations, most notably the lights and bumpers, which different from European standards.
The incompatibility requires manufacturers to develop USDM and EDM versions of their models if they want to sell them in both regions.
Sometimes the conversion in the factory lane is done after the model was launched in the European market.
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