Final answer:
The Industrial Revolution most profoundly influenced the last two centuries, transforming societies with technology and industrialization.
Step-by-step explanation:
The Industrial Revolution had the greatest influence over the last two centuries. This period marked a shift from agrarian economies to industrialized ones, creating dramatic changes in all aspects of society, including technology, industrialization, and urbanization. The changes brought on by the Industrial Revolution have accelerated lifestyle and technological advancements.
Significant political revolutions also occurred, such as the Russian Revolution, which had profound impacts on both the country of Russia and the global stage, influencing the First World War and political structures. Contrastingly, the American Revolution was integral in shaping the political landscape of the Western world and has been studied for its causes, conflicts, and consequences.