a) Reasons why the ummayad and abbasids rolling dynasties came to end were: i) military defeats ii) unpopular rule b) write down which reason applied to the ummayad and which to the abbasids ​

d) a constitutional amendment

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )    

first industrial revolution - the first wave of the industrial revolution lasted from the late 1700s to the mid-1800s. it industrialized the manufacture of textiles and began the move of production from homes to factories. steam power and the cotton gin played an important role in this period.