Explain why the efforts to provide
African Americans with their own land
failed.

Check google mate it's easy

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.

They hold a political party

So allah will forgive them