And so the more revenue and soldiers you have, well, that could help you just accrue more and more power. And so this is the classic loop that you see why most empires tried to expand, and sometimes when they stopped expanding, you see that they started to decline. But now in this video, from the early 18th century to the beginning of the 20th century, we have new things at play. We have the technological innovation from the Industrial Revolution, things like electricity and steam power. You see the notion of capitalism come into its prime, this focus on where do you maximize your returns for a given amount of capital that you have. And land is a form of capital, but as we will see, as we saw in some of those pictures, as technology becomes more and more valuable, things other than land become very important forms of capital, like factories, like railroads, like ships. And related to these two ideas, you have industrialization, which is the use of technology to become more productive, to increase output, and they all feed off of each other.