Answer:
It helped Britain and its allies maintain its vital supply lines.
The Destroyers-For-Bases Deal was an agreement between the U.S. and the UK on September 2nd, 1940. This deal transferred fifty mothballed destroyers from the United States Navy in exchange for land rights on British possessions.
The agreement permitted Britain to delegate much of Bermuda's defense to the still-neutral US, allowing British soldiers to be redeployed to more active theaters and allowing the creation of vital infrastructure at US cost, which British forces would also utilize.
The Destroyers for Bases Agreement was signed by Roosevelt. The US offered the British 50 outmoded destroyers in return for 99-year leases on territory in Newfound land and the Caribbean under the provisions of the Agreement. The regions would serve as US air and naval facilities.
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