The opening sentence line of an informative essay should include further information and details, especially from authorized sources. The reason is the writer must convince readers to continue reading and provide evidence to support his or her point of view. Therefore, the audience will consider the text as a valuable reference and will be more likely to be persuaded by the author's perspective.
Wouldn't this mostly be considered a historical question? I understand that it is writing, but I think you could get more accurate replies by putting it under the history category.