Explain the role that Collateralized Debt Obligation (CDO) has played during the last financial crisis.

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I have already finished the introduction part and the first part of this essay. Now I want you help me to write the main part and the conclusion of this essay. In the part which I wrote, I described what the CDO it is and simply introduce its performance in the last financial crisis. Besides, I give reasons why CDO grows in the last few years. Now what I want in the main part is how the CDO affected the financial crisis (the progress of its getting involved in the financial crisis, how did it contribute to the financial crisis, maybe its disadvantages can be added. Finally, to conclude what role it played, and summarize.