City Is To Sorrowful As Left Is To Right.
that is known as : Volunteer Reinforcement
Since the house has a very limited man power to do some tasks that is very important for the Government, they often ask for Public's help to do it for them ( usually those who support the current Government officials)
This is an article that should help you answer this question.
All of the above. Haiti is located near a major fault zone, half of its population at the time lived in densely populated urban areas; their weak government, which is a remnant of colonial impact, is very poor for the same reason and therefore did not have buildings up to code regarding earthquakes.
Not sure about poor soil but it probably didn't help if that is true. Islands aren't exactly famous for a lot of quality soil (large amount of sand which is unstable).