Final answer:
The Battle of Trafalgar took place off the coast of Spain in 1805, resulting in a decisive British victory and securing their naval dominance.
Step-by-step explanation:
The Battle of Trafalgar took place off the coast of Spain on October 21, 1805. It was fought between the British Royal Navy and the combined fleets of France and Spain during the Napoleonic Wars. The British, led by Vice Admiral Horatio Nelson, achieved a decisive victory, ensuring British naval dominance for the next century.