To make an introduction you must include the basic information of the text and to make a paragraph you must include detailed information about the main topics of the text.
The introduction is the initial part of a text in which the specific context is included and a summary of what will be explained in the development is usually expressed in the body of the text.
The paragraph is the fragment of a text and is made up of a set of main and secondary sentences to develop a certain topic in a logical and coherent way.
According to the above, to write a text with an introduction and two paragraphs we must include the information collected on the main topic (Vietnam War). In the introduction give a general idea and in the paragraphs develop two main ideas (one for each paragraph).
Note: This question is incomplete because the documents are missing. However I can answer is based on my general prior knowledge.
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