LONDON (AP) — When British Prime Minister Keir Starmer said Monday he is stepping down, he became the sixth person to make a farewell speech in front of No. 10 Downing Street in a turbulent decade of U.K. politics. Starmer had pledged to bring stability, grow the economy and end years of political chaos under the Conservative Party when he was elected in 2024 in a landslide victory for his Labour Party. Barely two years later, Starmer was forced to step down after his popularity plummeted and