Bush nearly places the Queen in 18th century (Reuters):

President George W. Bush, no stranger to the occasional verbal misstep, nearly placed the Queen in the 18th century on Monday in welcoming her to the White House on a state visit.
[...]
Bush noted the Queen’s long history of dealing with successive American governments, just barely stopping himself before dating her to 1776, the year the 13 colonies declared their independence from Britain.

“The American people are proud to welcome your majesty back to the United States, a nation you’ve come to know very well. After all you’ve dined with 10 U.S. presidents. You’ve helped our nation celebrate its bicentennial in 17 — in 1976,” Bush said.