by Sage Pearce-Higgins Fri Nov 10, 2017 12:07 pm
If you speak a dialect of English close to British English, then you're probably used to collective nouns being plural. For example "The team are winning."; "The army leave tomorrow."; "The jury have made a decision." etc. However, in GMAT, following American English norms, collective nouns are singular, hence it would say "The team is winning."; "The army leaves tomorrow."; "The jury has made a decision." etc.
The word 'majority' is a collective noun, so the sentence you quote is correct. As for the meaning, no worries about one thing coalescing, that can happen quite easily. Think of other examples, such as "The whole lake froze, coalescing into a single block of ice."; "The army has coalesced into a single fighting unit."