Historical connection sometimes implies the positive and negative effect of a certain subject from its past up to its future effects. So for example, the connection of the peoples point of view before and after a bombing incidents. I hope this will help you. Have a nice day
Thesaurus will be most helpful because it will give you new words to use in your vocabulary it will express words in new ways which will in turn help your ideas be expressed differently
Whenever you use other writers' ideas, however, you must acknowledge your sources. Doing so allows you to distinguish between your ideas and those of others; it directs your readers to relevant sources; and it allows you to give credit where credit is due. It is important to properly reference and cite your sources to avoid plagiarism and to give credit for original ideas.
Putting source material in your own words shows readers that you have a true understanding of that material. Also, to restate in your own words the full meaning of a phrase or passage helps readers understand difficult, complex, jargon-riddled or ambiguous passages.