Final answer:
The switch from matriarchal to patriarchal societies in ancient times was influenced by factors such as external invasions and the development of agriculture. Warfare and the division of labor were also contributing factors.
Step-by-step explanation:
The main cause of the switch from matriarchal to patriarchal societies in ancient times is believed to be the result of various factors, including the influence of external invasions and the development of agriculture. In many ancient societies, the introduction of warfare played a significant role in the rise of patriarchy, as men took on the role of protectors and defenders. Additionally, the shift from nomadic to settled agricultural societies led to a division of labor, with women primarily responsible for domestic tasks and men working in the fields.