Elizabeth II child Prince Edward, Duke of Edinburgh
In 1957, Elizabeth made a state visit to the United States, where she addressed the United Nations General Assembly on behalf of the Commonwealth. On the same tour, she opened the 23rd Canadian Parliament, becoming the first monarch of Canada to open a parliamentary session. Two years later, solely in her capacity as Queen of Canada, she revisited the United States and toured Canada. In 1961, she toured Cyprus, India, Pakistan, Nepal, and Iran. On a visit to Ghana the same year, she dismissed fears for her safety, even though her host, President Kwame Nkrumah, who had replaced her as head of state, was a target for assassins. Harold Macmillan wrote, "The Queen has been absolutely determined all through ... She is impatient of the attitude towards her to treat her as ...  a film star ...  She has indeed 'the heart and stomach of a man' ...  She loves her duty and means to be a Queen." Before her tour through parts of Quebec in 1964, the press reported extremists within the Quebec separatist movement were plotting Elizabeth's assassination. No attempt was made, but a riot did break out while she was in Montreal; Elizabeth's "calmness and courage in the face of the violence" was noted.Elizabeth gave birth to her third child, Prince Andrew, in February 1960, which was the first birth to a reigning British monarch since 1857. Her fourth child, Prince Edward, was born in March 1964.On 21 October 1966, the Aberfan disaster in Wales saw 116 children and 28 adults killed when a colliery spoil tip collapsed, engulfing Pantglas Junior School and the surrounding houses in the village. The Queen was criticised for waiting eight days before deciding to visit the village, and her delay in visiting the scene was a mistake that she later regretted.
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