 The American dollar unit was first introduced in the US in the year 1792, based on the average weight of a selection of worn Spanish dollars. As such, the American dollar was marginally less valuable than the Spanish dollar.
<coherence>  The American dollar unit was first introduced in the US in the year 1792, based on the average weight of a selection of worn Spanish dollars. As such, the American dollar was marginally less valuable than the Spanish dollar.
 The American dollar unit was 