Answer
Ellen Johnson Sirleaf, Africa's first elected female head of state, became president of Liberia in 2006. Her rise to power was made possible in part by the efforts of Leymah Gbowee, a Liberian peace activist and Nobel laureate. Gbowee played a crucial role in mobilizing women and leading a nonviolent protest movement that helped bring an end to the country's civil war and paved the way for democratic elections.