Producers use science and the blank to create a new product or make old ones better ?

Bbecause the jim crow laws were made to make voting difficult for african americans

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.