The general purpose of speech is to inform. The universally useful of any discourse will be either to Inform; Motivate/Persuade, or Entertain your group of onlookers. When you know the broadly useful of your discourse you can build up your Specific Purpose Statement. Your Specific Purpose Statement is utilized to build up your discourse.
<span>the Adams-Onís Treaty </span>
If you look at the sky on a clear night,you can see the Little Dipper