Many People may change the world a little bit, Perhaps Hitler's grandfather, or Father, , Cousin, Friend etc... somehow provoked Hitler to become the man he became, (Not a good comparision, but i hope you see where im going with this).
Or For example A friend of Ghandi's, or a relative some how motivated Ghandi to be what he was... Same goes with every historical figure, Malcom X, MLK, FDR, Edison, Tesla, B. Franklin, Machiavelli, Napoleon, Charlemane, etccccc...
All Historical figures are people, just like me and you, the difference is the path they took in life, the way they observed the world, and from those observations made their own ideas, and got lucky enough to be able to be noticed. 2pac is no different, he observed, maybe had some interesting conversations growing up with people, and with that came his own ideas and he decided to express them, but also was lucky enough to express them. And with those ideas he had a talent, his personality. Just like other historical figures had talents, in mathematical senses, social senses, or warlike senses etc.
Right now he is not on the same level as many American or world House hold historical names, or even classroom orientated names; however, that doesnt mean that cant change, you do have to realize its only been 9 years after his death, it usually takes quite awhile for someones work to be appriciated (maybe 100years +) or to be able to see on the grander scale what that person did for society. Just like Historical figures were influenced, 2pac Has the same potential to influence a house hold named historical figure.