Has any U.S. presidential candidate ever won every state in an election?

George Washington was unopposed in his two terms; he was elected unanimously. James Monroe was unopposed in his second term, in 1820,but was not elected unanimously; one of New Hampshire's electors voted for John Quincy Adams. Otherwise, the closest anyone has come to winning all the states in a contested election was Richard Nixon in 1972, when he won 49 of 50 states, losing only Massachusetts to George McGovern.

In 1984, Ronald Regan also won 49 of the 50 states against Walter Mondale, with only Mondale's home state of Minnesota voting for him. So there have been two contested elections in which Presidential candidates have won 49 of 50 states: Nixon over McGovern in 1972 and Reagan over Mondale in 1984.

There weren't any states in the time of General George Washington.

There were states at the time Washington was elected. The US had been operating under the Articles of Confederation for quite a few years at that time, and in fact had several men who held the office of "President of the United States of America, in Congress Assembled." John Hanson of Maryland was the first of these men.
Retired Gen. Geo. Washington even wrote Hanson a letter congratulating him upon his obtaining that office. Look for webpages using his name or Articles of Confederation for a source.

heh ok, you're right. Thanx for the correction. And yes, I was aware of John Hanson and the rest of that uncommon American history. Just got my dates a bit mixed up.

This might be of interest to you, as it was for me, a good refresher:

1776 - The U.S. Declaration of Independence is signed and approved by the Continental Congress on July 4, declaring the seperation of the 13 colonies from Great Britain.

1781 - Ratification of The Articles of Confederation (March 1), a document proposed on June 11, 1776, before the Declaration of Independence, but not agreed upon by Congress until November 15, 1777. British soldiers surrender in Yorktown. John Hanson elected first President of America under the Articles of Confederation (Nov.3).

1783 - American Revolution ends. The Maryland Gazette eulogizes President Hanson's death (November 21),

1784 - Treaty between America and England ends British sovereignty in America.

1787 - The U.S. Constitution is signed.

1789 - General George Washington elected first President of the United States of America under the articles of the U.S. Constitution. Parisians storm the Bastille, the great state prison of France, beginning the French Revolution.

1790 - Philadelphia, PA. becomes U.S. capital.