Kathryn Pint

Elizabeth II (21 April 1926 – 8 September 2022), became head of the Commonwealth and queen regnant of seven independent Commonwealth countries: the United Kingdom, Canada, Australia, New Zealand, South Africa, Pakistan, and Ceylon on 6 Feb 1952.

She reigned through major constitutional changes, such as devolution in the UK, Canadian patriation, and the decolonisation of Africa. Her many historic visits and meetings include a state visit to the Republic of Ireland and visits to or from five popes. Significant events have included her coronation in 1953 and the celebrations of her Silver, Golden, and Diamond Jubilees in 1977, 2002, and 2012 respectively. In 2017, she became the first British monarch to reach a Sapphire Jubilee. She is the longest-lived and longest-reigning British monarch as well as the world's longest-reigning queen regnant and female head of state, the oldest and longest-reigning monarch and the longest-serving head of state.

The Vietnam War took place from 1 November 1955 to the fall of Saigon on 30 April 1975, with US involvement ending in 1973. It was the second of the Indochina Wars and was officially fought between North Vietnam and the government of South Vietnam. The North Vietnamese army was supported by the Soviet Union, China, and other communist allies; the South Vietnamese army was supported by the United States, South Korea, the Philippines, Australia, Thailand and other anti-communist allies.

An anti-war movement gained strength in the US. Nixon appealed to the "silent majority" of Americans who he said supported the war but revelations of the My Lai Massacre, and the 1969 "Green Beret Affair" provoked national and international outrage. In 1971 the Pentagon Papers were leaked to The New York Times. The top-secret history of US involvement in Vietnam, commissioned by the Department of Defense, detailed a long series of public deceptions on the part of the US government.

Joseph Philippe Pierre Yves Elliott Trudeau (October 18, 1919 – September 28, 2000) was a Canadian statesman who served as the 15th prime minister of Canada (1968–1979 and 1980–1984). He was the third longest-serving prime minister in Canadian history (behind William Lyon Mackenzie King and John A. Macdonald), having served for 15 years, 164 days.

Trudeau became a media sensation, inspiring "Trudeaumania", and took charge of the Liberals in 1968. From the late 1960s until the mid-1980s, his personality dominated the political scene to an extent never before seen in Canadian political life. Despite his personal motto, "Reason before passion", his personality and political career aroused polarizing reactions throughout Canada.

His eldest son, Justin Trudeau, became the 23rd and current Prime Minister as a result of the 2015 federal election and is the first prime minister of Canada to be a descendant of a former prime minister

Richard Milhous Nixon (January 9, 1913 – April 22, 1994) was the 37th president of the United States from 1969 until 1974 and the only president to resign from the position.

Nixon ended American involvement in the war in Vietnam in 1973 and brought the American POWs home, and ended the military draft. Nixon's visit to China in 1972 eventually led to diplomatic relations between the two nations and he initiated détente and the Anti-Ballistic Missile Treaty with the Soviet Union the same year.

By late 1973, the Watergate scandal escalated, costing Nixon much of his political support. On August 9, 1974, he resigned in the face of almost certain impeachment and removal from office. After his resignation, he was issued a controversial pardon by his successor, Gerald Ford.

Sir Edward Richard George Heath (9 July 1916 – 17 July 2005), known as Ted Heath, was a British politician who served as Prime Minister of the United Kingdom from 1970 to 1974 and Leader of the Conservative Party from 1965 to 1975. He was a strong supporter of the European Community (EC), and after winning the decisive vote in the House of Commons by 336 to 244, he led the negotiations that culminated in Britain's entry into the EC on 1 January 1973. It was, says biographer John Campbell, "Heath's finest hour".

Heath's premiership also coincided with the height of the Troubles in Northern Ireland, with the suspension of the Stormont Parliament and the imposition of direct British rule. Unofficial talks with Provisional Irish Republican Army delegates were unsuccessful, as was the Sunningdale Agreement of 1973.