The Third Anglo-Afghan War took place from 1919 to 1921 between the British Empire and Afghanistan. It was primarily fought over Afghanistan's desire for independence and the British aim to maintain control over the region. The war began after Afghanistan declared war on Britain following the end of World War I, leading to a series of military confrontations. The conflict resulted in significant changes for Afghanistan. The Treaty of Rawalpindi, signed in 1919, recognized Afghanistan's independence, marking the end of British influence in the country. This war set the stage for Afghanistan's future as a sovereign nation, although it continued to face internal and external challenges.