Until the middle of the 19th century, ships were almost always launched stern-first, the way they had been for thousands of years. But as technology improved, ships grew in size, and the space constraints of narrow waterways led to the need of new launching practices.
By World War II, side launches had become common. Now side launches are the only way to move battleships into the water for the first time if they're being launched into smaller waterways such as rivers or inlets.
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