Why England fought France in 1805?

England fought France in 1805 primarily due to ongoing tensions stemming from the Napoleonic Wars, as Britain sought to counter Napoleon Bonaparte's expansionist ambitions across Europe. The British aimed to protect their interests and maintain the balance of power, fearing that a French hegemony would threaten their trade and colonial holdings. The conflict culminated in the pivotal naval Battle of Trafalgar, where the British fleet, led by Admiral Nelson, decisively defeated the French and Spanish navies, solidifying British naval dominance.