Why do the planets of our solar system orbit the Sun in an inclined plane?

The moon is orbiting in a five-degree inclined plane from the orbital plane of the earth around the Sun.
There is no explanation till date why the moon is orbiting the earth in a such a five-degree inclined plane. 
The reason for the moon orbiting the earth in a five-degree inclined plane is that, when the moon is orbiting the earth, while the earth is revolving around the Sun, it is following the Sun which travels in the space at a speed of twenty kilometres per second.
This means that when the Sun is moving forward in the space, all the planets orbit around the Sun in an upward-downward movement.
Even though the planets travelling in a vertical path from the direction in which the Sun is travelling, they are not orbiting the Sun in a ninety-degree angle. On the contrary, they are actually orbiting the Sun in a sixty-two-degree angle.
The plane in which the planets orbit around the sun in such a way is called ecliptic plane.
This is because, eclipses occur due to the passing of certain planets of the inner circle between the Sun and the planets of the outer circle.
However, all the planets do not orbit in this common axis, but orbit with a deviation of one or two degrees. 
For example, Mercury which is closer to the Sun, orbits around the Sun in a seven-degree inclination from this common plane.
Similarly, Pluto, the farthest planet from the Sun, is orbiting around the Sun in a seventeen-degree inclination from this common plane.
Eris, a dwarf planet which is even farther away from Pluto, is orbiting around the Sun in a forty-four-degree inclination from this common plane. 
The Sun traveling in the space at a speed of twenty kilometres per second is the reason for the planets orbiting the Sun in an inclined plane.
This means that the planets orbiting the Sun in an upward to downward direction,at the same time the Sun is moving forward. This in turn forces the planets to chase the Sun to revolve around it thereby resulting in the inclination of the orbital plane of the planets. 
This can be effectively reiterated by an imaginary illustration.
Imagine a giant-sized yellow balloon in the sky.
Visualize some crows circling around it in an upward-downward motion.
In this situation, imagine that the giant yellow balloon is beginning to drift forward.
At this point, the crows which were circling the yellow giant balloon will be forced to follow the balloon to circle it. This will result in a minor inclination and extension in the circular path of the crows.
Likewise, the orbital path of the planets revolving around the Sun, which is traveling forward, will also become inclined and elliptical.
At this juncture, also think of a sparrow circling one of those imaginary crows in an upward-downward direction. 
You can very well say that the circular path of the sparrow will also become elliptical and inclined.
In the same manner, when the circular path of the earth which is orbiting the Sun in an upward-downward direction changes to an inclined and elliptical path, the circular path of the moon which is orbiting the earth in an upward-downward direction also becomes inclined and elliptical.