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In fact, China, India and Brazil have declined to publicly endorse any candidate so far. Analysts say cite several reasons why the three developing nations have resisted.

China and India are historical rivals and are without many commn interests, even though they are at similar stages of development.

And Brazil is vying to be an alternative to the U.S. and regards Mexico as a close U.S. ally, said Domenico Lombardi, a senior fellow at the Brookings Institution and former IMF official.

“Emerging countries have failed to coalesce as a unified group behind a candidate,” Mr. Lombardi said.