D3 - Loading data from JSON doesn't work

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I'm starting to learn D3 and it seems like a powerful framework. I'm trying load the data from json. I can see data but nothing happen after loading data into D3 library. There are no error messages in the JavaScript console.

Here's my code:

Map Plunker : http://plnkr.co/edit/wHIsaB?p=preview



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