Because the context of what your speaking about is already given. Your just putting it into your own words.
U.S. immigration law is very complex, and there is much confusion as to how it works. The Immigration and Naturalization Act (INA), the body of law governing current immigration policy, provides for an annual worldwide limit of 675,000 permanent immigrants, with certain exceptions for close family members.
Once a topic has been chosen, ideas have been generated through brainstorming and free writing, and a working thesis has been created, the last step a writer can perform in the prewriting stage is creating an outline. An outline allows a writer to categorize the main points, to organize the paragraphs into an order that makes sense, and to make sure that each paragraph/idea can be fully developed. Essentially, an outline helps prevent a writer from getting stuck when performing the actual writing of the essay.
An outline provides a map of where to go with the essay. A well-developed outline will show what the thesis of the essay is, what the main idea of each body paragraph is, and the evidence/support that will be offered in each paragraph to substantiate the main points.
