No one actually knows why. There are many theories though as to why the right hand became the preferred one.
One theory is that since the heart is on the left side, people would hold the shield with their left arm and fight with their right side. However, people who are left-handed have been proven to have an advantage in fighting and sports because right handers are not used to fighting or playing against left handers (surprise effect).
It has also been shown that people tend to prefer using the hand with the longer arm bone.
For more articles on the advantage of being a lefty, you can look here:
Handedness is not just in humans; it also is not in animals only with hands (or paws or whatever)
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