What did Romans contribute to mortar?

How were most Roman emperors chosen after Commodus' death? What happened to Rabbi during the Holocaust? What did Benjamin Franklin send to Massachusetts named in his honor? Who gained more from the interaction between American Indians and the earliest European settlers in North America? In 1932 farmers on the Great Plains began to lose their crops because? Was the Indus River Valley an urban centered civilization? Who were the coaches of the 2003 Buffalo Bills? How big was The Dutch Colony of New Netherland and was it the first or second Dutch colony in the New World? What does Plymouth specialise in? Why was it hard to hide the jew's? What affects did the dropping of a bomb have on the war? How how does foreign invasions affect the decline of Rome? How do you say how are your mommy and daddy in German? Was the emancipation proclamation from the north or south? What three items did Marco polo trade? Who invented the accordian in 1829 By what other name is this instrement known? Who List at least three examples of the way the christian church exercised authority and offered hope in the middle ages? How metals are moulded in a blacksmith shop? In 1949 Nationalist leader Chiang Kai-shek set up a provisional government in Taipei claiming to represent not just Taiwan but all of China? What does Rome look like?