century, the Great Divergence peaked before the First World War and continued until the early 1970s, then, after two decades of indeterminate fluctuations, in the late 1980s, it was replaced by the Great Convergence as the majority of Third World countries reached economic growth rates significantly higher than those in most First World countries". Others have observed a return to Cold War-era alignments (MacKinnon, 2007; Lucas, 2008), this time with substantial changes between 1990–2015 in geography, the world economy and relationship dynamics between current and emerging world powers; not necessarily redefining the classic meaning of First, Second, and Third World terms, but rather which countries belong to them by way of association to which world power or coalition of countries — such as G7, the European Union, OECD; G20, OPEC, N-11, BRICS, ASEAN; the African Union, and the Eurasian Union. History Most Third World countries are former colonies. Having gained independence, many of these countries, especially smaller ones, were faced with the challenges of nation- and institution-building on their own for the first time. Due to this common background, many of these nations were "developing" in economic terms for most of the 20th century, and many still are. This term, used today, generally denotes countries that have not developed to the same levels as OECD countries, and are thus in the process of developing. In the 1980s, economist Peter Bauer offered a competing definition for the term "Third World". He claimed that the attachment of Third World status to a particular country was not based on any stable economic or political criteria, and was a mostly arbitrary process. The large diversity of countries considered part of the Third World — from Indonesia to Afghanistan — ranged widely from economically primitive to economically advanced and from politically non-aligned to Soviet- or Western-leaning. An argument could also be made for how parts of the U.S. are more like the Third World. The only characteristic that Bauer found common in all Third World countries was that their governments "demand and receive Western aid," the giving of which he strongly opposed. Thus, the aggregate term "Third World" was challenged as misleading even during the Cold War period, because it had no consistent or collective identity among the countries it supposedly encompassed. Development aid During the Cold War, unaligned countries of the Third World were seen as potential allies by both the First and Second