Is it not the case that there are difficulties and challenges facing researchers everywhere, not just in th ird world countries. There is so much competition to publish. Some work in Western countries is not good. Much depends on which university a researcher is attached to. I have read rubbish articles by Edinburgh university employees, for example. So it is not as simple as claiming there is racism. there might be, but the situation is complicated and unless some statistical analysis is attempted it is difficult to tell.
This is a multifactorial problem, and the question has some problems the way it is stated.
1) Claim that "always" there are difficulties (racism) related to publishing from "third word" countries, is inaccurate. There are very prolific authors from countries that are considered as "third world" and even some of those authors belong to the 2% highly cited authors that is annuallyworld shared. So, the "always" is not really always. The second problem I have with the Question is "third world" countries. The definition of third-world countries is outdated and extremely difficult to understand. I strongly recommend Hans Rosling's book, Factfulness to understand that 3rd world is something that puts together nations that are not similar at all.
2) Most of the high-impact journals are published in English. Most scientists in the world are not native English-speaking people, and therefore we have much more problems in communicating, not only because our English may be far from perfect, but also because due to cultural background communication could be less efficient. For instance, Spanish-speaking people (my case) tend to write much more complex sentences, because in our language is quite common to express ourselves using sentences with double and even triple verbs.
3) High-impact journals are pro-publishing research with the latest technologies or the latest approaches. In poor countries, or countries that have not reached full development (see why is so difficult to use 3rd world countries!), the technologies used maybe 10, 20, 30, or even longer years behind the state of the art.
4) As a Mexican who has emigrated to Europe and have had the chance to work in 4 different countries, on the side of Mexico, I can tell that I have felt no discrimination related to racism in my research activities. I have found limitations due to the nationalism of some academic systems, but when getting to the point of publishing, I don't see racism. And every day more and more publications are ledhas by people with Latin American, Indian, Chinese, and many other backgrounds.
5) All human activity has a bias, and it is likely that some editors may have a preference for those groups or those lines of research that they consider better, and therefore some groups may have a preference, but globalization of the scientific publishing business is changing the shape of that.
So, in short, the problem is not linked to racism (maybe there are some isolated cases) but to many other factors.
When I submit research to one of the distinguished scientific journals, and the status continues under review for 9 months, and the required revisions are made, then the editor is rejected (what does that mean?)
I don't know, but claiming racism out of that is jumping to conclusions. What was the reason of the editor for the rejection? They should tell you the reasons. It is very hard to get published, and we all have horror stories related to that.
Try to make the abstract more interesting to the readers to read more of your paper, the same thing as the introduction. Many rubbish papers give more impressions of good ones. always check the journal's previous publishing if they didn't publish papers the same as your subject, try to waive them from your list.
I think there is a crisis of trust between the authors and editors of such journals or they do not meet their inclinations, whims, or ideas (evidence when a colleague from a Western country is added to the manuscript, who does not find it difficult to publish). Or perhaps to increase the rejection rate, raising the journal's rank.
But in general, repeating the attempt works, do not despair
The simple answer to this question is only the English language. When Editors see papers coming from non-English countries, they either reject or suggest editing from their services. The Publishers and Journals are earning. This business has become profitable. I am not saying that every journal is the same but 90% are converting into an Open-access policy.