I need articles on the pros of terrorism and the colonies.
That is such a broad topic that it will be difficult to research. You can certainly do a search on colonies AND terrorism, but you will get thousands of articles, and at least theoretically, pros for terrorism may be different in each case.
The best database to use would be EBSCO Academic Search Complete. If you are off campus, you will need to log in with your COM ID. After you do your broad search, review your list of articles. You may want to choose a couple of specific areas to focus on to get your articles, such as the British in India.