Stefan Dercon creates a Wordle of country studies in the top 5 economics journals, by country. The result:
About 63% of the articles were on the US and 12% on the UK. Canada is the next in line with 2.7%. China and India were each covered by just under 2% of the articles. The whole of sub-Saharan Africa had 1.8% of articles.
Here is the Journal of Development Economics:
Latin America is somewhat overrepresented with 30%, India gets 12%, China 11% and Africa 18%.
Stefan’s fuller analysis here.