Bing-powered sites broke the 30% United States search market share in March 2011 as it rose from 28.48% in February, to 30.01% last month.

In the process, Google lost some of the market share; dropping from 66.69% in February, to 64.42% where it currently sits at, according to Hitwise.

Meanwhile, Yahoo! Search, which powers Bing, rose from 14.99% to 15.69% of the market.

*Graph taken from Hitwise

Now that Bing is chewing away at Google’s market share, can and will Google fight back in April?