What are some of the ways that the physical and natural environment put limits on the directions and locations of trade routes in premodern times? 150 words at least pls

no statements but ok.

the statement that best describes the idea of manifest destiny that was used in the 19th century would be that "it was fate that the united states would continue to  expand westward," since people thought the us was "destined" to do so. 

survivors' attempts to remove themselves from, or protect themselves against distress. these reactions include trying to avoid talking, thinking, or having feelings about the traumatic event and avoiding any reminders of the event, such as people or places.