The speech followed a day of ceremonies and remembrance for the 3,025 people killed or missing as a result of last year's attacks, whose names were read out during the service in New York.
And an eternal flame was lit at sunset at a memorial service at the Sphere, in Battery Park, a sculpture which once stood in the plaza of the World Trade Centre.
If you want to talk to schoolchildren in America and share your thoughts about 9-11 with them, then visit our message board using the yellow link at the top of this page.
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