What conclusion can be drawn from the passage of the 13th, 14th, and 15th amendments to the u. s. constitution? a. the passage of the amendments was to strengthen the bill of rights. b. the passage of the amendments was to weaken the jim crow laws that were passed in the north. c. the passage of the amendments was to weaken the jim crow laws that were passed in the south. d. the passage of the amendments was to abolish slavery and establish rights to previous slaves?