The biggest fleet ever assembled until when?

he defeat of Germany had forced it to agree that its naval force, the second biggest after the Royal Navy's Grand Fleet, would be handed over to the allies, and to make sure that it delivered on its promise, Britain and its allies deployed their full naval might: 370 vessels, the most powerful armada ever assembled.

Explanation:

The Battle of Leyte Gulf was the biggest and most multifaceted naval battle in history. It involved hundreds of ships, nearly 200,000 participants, and spanned more than 100,000 square miles. Some of the largest and most powerful ships ever built were sunk, and thousands of men went to the bottom of the sea with them.

they required less loading and unloading

explanation:

the shipping container improved shipping because it cut down on unloading time by three weeks, eliminated wasted space, and allowed ships to carry.