What became of Mercedes-Benz trucks in the USA?

Why are there no longer Mercedes-Benz medium and heavy duty trucks sold in the US? The buses, vans, and transporters are also excluded from US
market, too.
Even the Sprinter is sold as Freightliner and Dodge in the USA. Same with Unimog sold here as Freightliner.
The Freightliners and Sterlins (both in DaimlerChrysler group) are outdated in appearance...
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