Added US second level navigation

![usa](https://f.cloud.github.com/assets/76709/2527274/3f513682-b503-11e3-9662-41b8d21c3487.png)



![usa-120-animated-flag-gifs](https://f.cloud.github.com/assets/76709/2527288/6047dcec-b503-11e3-926a-5da2b23f608f.gif)