Gallery: Elizabeth II with the presidents of the United States

If there are two countries whose alliance has been strong since the dawn of the 20th century, it is that of the United States and the United Kingdom of Great Britain. That alliance was forged during World War I, when the country emerged from isolationism under Woodrow Wilson, and was definitively sealed during the post-war period and World War II.

Elizabeth II began her reign on the ashes of a war-torn Europe, divided after communism's grip throughout the territory. However, the new institutional architecture (United Nations, Bretton Woods) seemed to point towards a more multilateral and cooperative world, at least among democracies.

February 6, 1952 marked the beginning of her reign. When this photo was taken with President Harry Truman, the British crown had not yet been placed on her head; she was replacing her father, who was in failing health. The presidential couple welcomed Princess Elizabeth and the Duke of Edinburgh at the Blair House, which was the Truman family residence.

In October 1957, the British royal couple joined Dwight and Mamie Eisenhower at the White House for four days.

In June 1961, Queen Elizabeth II and the Duke of Edinburgh returned to the White House to see one of the most cinematic presidential couples, the Kennedy's.

Richard Nixon visited the Queen of the United Kingdom in October 1970. Alongside his wife, Pat, they visited Chequers, the country house in the the county of Buckinghamshire, England. The visit was in response to the one made in June of the same year by Prince Charles and Princess Anna.

This remarkable photo shows Elizabeth II dancing with U.S. President Gerald R. Ford at a White House dinner in honor of the Queen of Great Britain. It was July 7, 1976.

Elizabeth II and the Duke of Edinburgh, along with the Queen's mother, hosted several world leaders at Buckingham Palace, including Valery Giscard d'Estaing, Giulio Andreotti, or Jimmy Carter.

Ronald and Nancy Reagan welcomed Queen Elizabeth II and the Duke of Edinburgh to the White House on June 8, 1982.

In another rare photo, the Queen of Great Britain is seen accompanying U.S. President George H. W. Bush as he planted a tree on the South Lawn of the White House to commemorate the visit on May 14, 1991.

William Jefferson Clinton, 42nd president of the United States, and his wife Hillary, visited Buckingham Palace as part of a five-day European tour. Bill Clinton and Elizabeth II walked down the stairs followed by the Duke of Edinburgh and Hillary Clinton.

Queen Elizabeth II and the Duke of Edinburgh visited the White House on May 7, 2007. The president was George W. Bush, who was accompanied by his wife, Linda. They dined in the Dining Room, and watched a performance by violinist Itzhak Perlman in the East Room.

On April 1, 2009, with his new presidency, Barack Obama crossed the Atlantic Ocean for an official visit to the United Kingdom. In Pete Souza's photo, Michelle Obama greets the Queen of Great Britain at Buckingham Palace, followed by her husband, the 44th President of the United States.

President Donald J. Trump, and First Lady Melania Trump pose with the Queen of the United Kingdom, the Duke of Edinburgh and Duchess of Cornwall on June 3, 1919.

The last president she met as Queen Elizabeth II was Joe Biden. Here, he posed with his wife and the Queen, in the absence of the Duke of Edinburgh, who died on April 9, 2021. The photo was taken on June 13, 2021.