tragedy - a very sad event or situation, root - the cause or origin of something, veteran - someone who has been in the armed forces during a war, significant - important or noticeable, union - the act or the state of being joined together, commemorate - to remember officially and give respect to a great person or event, memorial - an object, often large and made of stone, that has been built to honour a famous person or event, Constitution - a written set of rules by which a country, state, or organization is governed, custom - a way of behaving or a belief that has been established for a long time, Independence - freedom from being governed or ruled by another country, silence - a period without any sound, memory - the ability to remember information,

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