Invasions refer to the act of entering a territory with the intent to conquer or occupy it. This can involve military forces crossing borders to take control of land, resources, or populations. Throughout history, many civilizations, such as the Roman Empire and the Mongol Empire, have conducted invasions to expand their influence and power. Invasions can lead to significant changes in the affected regions, including shifts in governance, culture, and demographics. They often result in conflict and can have lasting impacts on the societies involved. Notable examples include the Norman Conquest of England in 1066 and the Spanish Conquest of the Aztec Empire.