Queen Elizabeth and her husband, Prince Philip, are heading back to England following their six-day American visit.
The final event was a dinner at the British Embassy in Washington for President and Mrs. Bush. The queen was returning the favor of Monday night's state dinner at the White House.
The queen's toast included a gentle dig at the president for his slip of the tongue on Monday. She drew a laugh by saying she wondered whether she should begin by saying, "When I was here in 1776." Bush suggested that she had celebrated the United States' founding in 1776 instead of 1976.
For his part, Bush praised "the friendship between the British and American people" as "one of the oldest and most enduring in history."
Earlier Tuesday, the queen visited NASA's Goddard Space Flight Center in Maryland and the World War Two Memorial on the National Mall.
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