What are some other geographical features that have limited settlement and migration of people in history?

What is one example of trench warfare ?

The second continental congress: a. made provisions for a continental army with george washington as commander-in-chief b. adopted a “declaration of causes of necessity of taking up arms” c. endorsed the olive branch petition d. all of the above

Iwould be super appreciative if someone could me out here! discuss the the following question: how influential were the three philosophers? why? (the three philosophers are locke, hobbes, and montesquieu)