Final answer:
Winston Churchill became the Prime Minister of Britain in May 1940, after Neville Chamberlain resigned. Churchill's leadership and his commitment to fight against Germany with all available means marked a turning point in World War II.
Step-by-step explanation:
Winston Churchill was voted in as Prime Minister to replace Neville Chamberlain in May 1940. As tensions escalated during World War II, Churchill stepped into the role after Chamberlain's resignation, bringing with him a policy of unwavering resistance against the Axis powers. He famously declared his commitment to fight by stating, "If you ask what is our policy, it is to wage war by sea, land and air with all our might. I have nothing to offer but blood, toil, tears and sweat."
In the British political system, the Prime Minister is not directly elected by the public. Instead, the Prime Minister is typically the leader of the majority party in the Parliament and is formally appointed by the monarch. However, during a crisis or when a vote of no confidence passes in the Parliament, a new Prime Minister can be appointed as was the case with Churchill.