to attract mass traffic coming from the US is the best strategy for adsense earnings.
To know what's hot at the moment, check out this list http://3pdf.com/?100=hot
It's a list created in real time from google trends over the past few days.
If you produce content about the 3 or 10 first topics, this WILL generate a lot of traffic soon.
Try it for just one week, everyday write one or more articles about those topics and tell me the results you've got.
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