Canada's TD Buys Banknorth for \$3.8 Bln  TORONTO (Reuters) - Toronto-Dominion Bank &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=TD.TO target=/stocks/quickinfo/fullquote"&gt;TD.TO&lt;/A&gt; made a  much-anticipated push into U.S. retail banking on Thursday,  announcing it would acquire a majority stake in Banknorth Group  Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=BNK.N target=/stocks/quickinfo/fullquote"&gt;BNK.N&lt;/A&gt; for \$3.8 billion.