Why the earth rotate west to east and not north to sout?

I would say there are two or three parts to this question. The first involves naming conventions, the second involves angular momentum, the third is our liquid core and magnetic field (which ties in to part one). Part one is best asked in a linguistics section "why do we call North, North?" Part two: the prevailing theory of the formation of the solar system is that we are condensed gas. As the cloud of hydrogen we used to be reacted to the influence of its gravitational field and collapsed, it started rotating. As clumps formed and stuck together (one of which became the Earth) it retained the angular momentum of the total (give or take) with the notable exceptions of Venus, Uranus and poor Pluto. Part three: as our metal core rotates, it kicks out a magnetic field, which is what we measured when we named it North. I don't remember if any of the other planets have magnetic fields significantly different than their rotational axes. There is a lot more, but space is limited.