How does bias affect the work of historians

Bias effects the work of historians by the way they portray the truth of the story.
Ex: a crazy neoNazi would think that Hitler did great things, create Germany's highway system, fight against animal cruelty, etc... however a Holocaust victim would think completely different, for obvious reasons.

The embargo act of 1807  was a law passed by the united state congress and signed by president thomas jefferson on december 22,  1807. it prohibited american ships from trading in all foreign ports. in 1806, france passed a law that prohibited trade between neutral parties, like the u.s., and britain.