What was the British Empire's role in World War 1?

The British Empire played a crucial role in World War I, contributing significantly to the Allied powers' military efforts. At the war's outset in 1914, Britain mobilized its vast resources, including troops from colonies and dominions such as Canada, Australia, and India, which supplied millions of soldiers and support. The British Navy also blockaded Germany, restricting supplies and impacting the enemy's war capability. Overall, the Empire's global reach and resources were instrumental in shaping the war's course and eventual outcome.