What would have to be the magnitude of an event for the government to decide to initiate martial law? Why?

debate the issues in this task.
On the Small Group Discussion Board, using the Library, Internet, or any other available materials, complete the following: discussing the possibility of martial law in the wake of a terrorist attack or a significant natural or man-made disaster.
What is the purpose of martial law? Explain.
What would have to be the magnitude of an event for the government to decide to initiate martial law? Why?
Currently, how likely do you think it is that martial law will be initiated in response to a significant terrorist attack or natural disaster? Explain.
With regard to the U.S. Constitution and civil liberties, what are the arguments against the use of martial law? Explain.
Do you agree or disagree? Explain your position.