What are two main Reason Christianity Spread during Roman Times?

The Roman empire was the tool enabling Christianity to spread. Christianity developed during the Pax Romana and during that time, with the good roads, safe sealanes, and relative peaceful. conditions, new ideas were able to be exchanged and spread, Christianity was one of them.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain

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.