WASHINGTON — The collapse last week of three of Puerto Rico's 10 banks significantly consolidated the commonwealth's banking system and marked one of the most complicated days in the history of the Federal Deposit Insurance Corp.

Analysts said the failures Friday of the $12 billion-asset Westernbank, the $6 billion-asset R-G Premier Bank and the $2.6 billion-asset Eurobank and their sale to three separate buyers were long overdue.

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