The American Navy was birthed in the Barbary Wars. Sure, there was a token navy in the Revolutionary War, but battles were mostly won in that war by American privateers (or, if you were British, pirates). To understand where the U.S. Navy came from, we need to take a step back and look at the stake of naval warfare in the 18th century. 

The early American Navy resembled the British Navy in its use of British ship designs, naval tactics, and organizational structures, largely inherited from the colonial period when the colonies relied on British maritime power. Many American naval officers had British training or were influenced by British traditions, such as ship discipline, officer ranks, and the use of frigates for protecting trade routes.

However, the U.S. Navy was different in its focus and scale. While the British Navy was a vast global force designed for empire-building and large-scale warfare, the early American Navy was smaller and more focused on defending American merchant ships, often relying on nimble frigates rather than large ships-of-the-line. Additionally, the U.S. Navy operated with a more democratic ethos, as naval officers in America were often more accountable to elected officials, reflecting the values of the new republic.