Final answer:
The Quasi-War was an undeclared naval conflict between the USA and France from 1796 to 1800, initiated by France's seizure of American ships trading with Britain.
Step-by-step explanation:
The Quasi-War was an undeclared sea war between the USA and France. This conflict occurred from 1796 to 1800, largely as a result of France's decrees during their war with Great Britain, which allowed them to seize any ship carrying British goods. This policy affected American ships, especially those trading in the West Indies with the British. After France declared the 1778 treaty with the United States null and void, they began to seize American ships, prompting President Adams to push for the expansion of the U.S. Navy. Consequently, an undeclared war, referred to as the Quasi-War, ensued, characterized by naval engagements and the capturing of American vessels by the French.