Youtube has millions of different keyword combinations that can be used to search through the millions of videos they have to offer.

When you search Youtube using the keywords 'South Dakota', you will find the #1 viewed video is titled "Boyfriend surprises girlfriend all the way from South Dakota, the best gift ever".

The total view count for this romantic video is over 2 million views and was posted in December of 2013.

The next closest video is just over 1.2 million views and is titled "Battleship X - The USS South Dakota" and has been posted since 2010.