title: Connecting git branches with no shared history on Github
body: <p>When creating a new repository on Github, I made the mistake of pushing a branch ORIGINAL that I did not want as the default branch first. My goal is to make a pull request from this branch into an empty master branch. My route to attempt to resolve this has been rather circuitous, as I am learning as I go:</p>
  
  <ol>
  <li>Created a master branch in the Github UI, which branched from ORIGINAL. This was all wrong because I needed an empty master branch.</li>
  <li><p>Created a new orphan branch named master and force pushed it to Github, then set master as the default branch. I was unable to make a pull request because of totally unrelated history between ORIGINAL and this orphaned master. I get the text "
  There isn’t anything to compare.
  master and ORIGINAL are entirely different commit histories."
  in the Github UI.</p></li>
  <li><p>Created an orphaned master branch, created a branch off of it, NEW, and cherry-picked commits from ORIGINAL onto NEW. I then renamed ORGINAL to ORIGINAL-unconnected, renamed NEW to ORIGINAL, and force pushed master and ORIGINAL to overwrite what I had previously. I am still unable to create a pull request because of completely unrelated commit histories.</p></li>
  </ol>
  
  <blockquote>
  <pre><code>* 74f259d (origin/ORIGINAL, ORIGINAL) Changes-2
  | * 2a64361 (origin/master, master) Initial commit
  | * bd2b261 (HEAD -&gt; SECONDARY) Changes-3
  | * 7fcbf80 Changes-2
  |/
  * cb9e481 Changes-1
  * 58e742a Create project
  * 106d156 Initial commit
  * 6a063bb (ORIGINAL-unconnected) Changes-2
  | * 85a8896 (SECONDARY-unconnected) Changes-3
  | * 8f8a64b Changes-2
  |/
  * 5f0f295 Changes-1
  * 5566377 Create project
  </code></pre>
  </blockquote>
  
  <p>Are the histories unrelated in both my local copy and on Github, or only on Github? What would be an effective way to resolve my issue?</p>