The battle fo Trafalgar was decisive, strategically speaking:
Before, the French could still threaten England, when they were not maintained by the Austrians an Russians to fight in the East
After, they could not threaten England anymore and had to rely on the Continental Blocus and impressive land victories against England's allies to win against England
i would say controling the entrance to the mediterrean sea quite strategic
not to mention the fact that gb is used to losing all the battles and winning all the wars, so we strategicly celebrate the battle to adorn our queen with gains of gold silver and tin, colonisation of assets, beach holidays and the biggest chiringuito in the atlantic, then theres all ...