> AngularJS was released in 2009 [1], whereas Backbone was released a year later in 2010 [2].

Sure,that's why i said

> It was one of the first successfull "clientside" framework

Did you miss the word successfull or what?

furthermore old angularjs looked more like Adobe Spry than current AngularJS,while Backbone hardly evolved(which is not good of course).