Final answer:
In the twentieth century, the rise of contemporary intellectual history and the emergence of Romanticism challenged the idea that only elites shape history. Historians began focusing on the psychology behind people's choices and exploring the history of human thought.
Step-by-step explanation:
In the twentieth century, particularly after World War I, historians became more interested in the psychology behind people's choices, leading to the rise of contemporary intellectual history. These historians focused on the ideas that drive people to make certain choices and explored the history of human thought. Additionally, the advent of Romanticism in the early nineteenth century challenged the belief that only elites could shape history, as it emphasized the greatness in everyday life and the importance of all individuals in the human experience.