Winston Churchill led Britain through significant events during the 20th century, notably World War II. His tenure as Prime Minister from 1940 to 1945 was pivotal, particularly during the Battle of Britain and the Dunkirk Evacuation. His stirring speeches galvanized the British public amidst the blitz and underscored his commitment to defiance against Nazi Germany. Churchill also played a crucial role in the post-war period, attending the Yalta Conference and emphasizing the need for a United Nations. His leadership solidified his legacy as a symbol of resilience and determination in the face of adversity.