<span>C.the railroads had to pass over mountains and rivers</span>
<span>The reason that people usually will be bothered by the absence of conventions of talk is that in our communication lies cultural similarities and differences. When we follow conventions of talk, we are following our cultural norms and this provides a level of comfort for those involved. When these are not followed, there is an uneasiness that comes with the unfamiliarity, and necessary assumptions about the meaning of the communication can not be made.</span>
Explanation:
led to economic depression
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