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The tower began to sink after construction had progressed to the third floor in 1178. This was due to a mere three-meter foundation, set in weak, unstable subsoil, a design that was flawed from the beginning.

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the tower started to lean in 1178 after they found out that the soil was too soft
1173
it started to lean when it was made. just ask gallileo. nice try though.
the tower started to lean because it was under very weak clay and it was to weak so it leaning
The Leaning Tower of Pisa began to lean during construction in 1260 because it was built partially upon sandy ground. This caused the weight of the tower to be too much for the ground and it began to lean on one side.
The Leaning Tower of Pisa was constructed in 1173 and began leaning shortly there after.
The tower started leaning at the onset of construction.

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