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The moon is not truly spherical: it has a slight bulge which points towards the Earth.The bulge was created by gravitational pull of Earth when the now solid moon was mostly liquid. Tidal locking is a bit like the front wheel of an upside down a bicycle, (stay with me).When the wheel is spun it always comes to rest with the valve at the 6 o'clock position.The valve makes that bit of the wheel heavier and point towards Earth.
Is it true that there was a collision which ripped off a part of the earth? ... and therefore voila!, a moon. Because it was once from the same origin, it rotates the same way as the earth does.
This also accounts for the Moon's orbit getting bigger and the Earth's day getting longer.