This question is very ambiguous. What constitutes a government failure? That is up to the reader to choose I suppose. To answer the question should it be allowed, I say yes. If the government fails to meet its people’s basic human needs such as food water and shelter I believe in fear of your own life and others around you it seems like a good last resort attempt to get what you need. In most cases I would say no but if something is threatening your or other human beings lives, then yes do what you have to do to survive.
B. To bring glory to their respective nations
Positive Affect: It brought money, land, resources, and a strengthened economy to the Americans.
Negative Affect: It caused war and tension with Mexico.
The British. Because they promised them that they would limit the colonist westward migration. (Which they did not follow through with)