How to solve the task for Backnbone.js on React.js?

Question

React

There is a test task for creating a SPA Task
description
Can be utilized any modern framework (Backbone.js is preferable). Decided to try using React.js.
What happened - My code
I couldn't figure out how to implement block state routing on the page.
?collapse={{ collapseIds }} - this part of the routing
Tell me if you started with the architecture correctly and how you can do it with the state for the page.