US reaction to death of Lady Thatcher
9 April 2013 Last updated at 06:54 BST
Margaret Thatcher's steadfast ally and close friend during the 1980s was President Ronald Reagan.
During that period, the "special relationship" between Britain and the US was elevated to heights never achieved before or since.
While she divided opinion in the UK, she was much more widely revered across the Atlantic.
Jane Little reports from Washington.