Why only north america ,europe ,and asia has host the olympcs?

Question

why south america or africa has never host the olympics?

Answer 1

Not true, Melbourne and Sydney, Australia were Olympic hosts.

Answer 2

It costs millions of dollars for  country to build the facilities to host the olympics, and many poor nations just cannot afford to do so.

Answer 3

As mentioned the amount of capital investment which has to be funded by the host country is substantially higher than most African & South American countries can fund

In the Netherlands we receive local news for London on BBC, and there are (even still now) constant reports as Londoners have been landed with increases to their local taxes to help fund the games.  This is not very well received as you can imagine!

Sponsorship & commercial funding does not cover the total bill and the local government must support any bid with funding to accompany the bid

Also of course there has to be facilities (venues, arenas of all types to cover all the different sports), accomodation & facilities to handle tourists) and a transport network in place to manager huge volumes of people.  

Plus after the games have taken place, once again the host country is left with the issue of what to do with the land/venues afterwards - e.g. redevelopment costs

Therefore it is not really an easy decision to take for any government, and a very costly affair which means that not all countries even wish to bid.