British Prime Minister Theresa May took office Wednesday, becoming the country’s second woman leader after Margaret Thatcher. May was formally appointed by Queen Elizabeth after a meeting at Buckingham Palace. The new prime minister succeeded David Cameron, who stepped down after Britain voted to leave the European Union. May is already being compared to Thatcher, the iconic former leader known as the “Iron Lady.” Thatcher, a Conservative, was Britain’s longest-serving prime minister of the 20th century, holding office from 1979 to 1990. Besides being Britain’s first female prime minister, she was also the first woman to lead a major Western democracy. One of the main comparisons between the two women is that May, 59, will be leading Britain through a historically important time. She will be in charge of overseeing the country’s complex transition out of the EU.