This right over here is a picture of a steamship which you could use for trade, but you could also use it to project military power. This here is a railroad. Similarly, transport goods and people, but it also allows you to keep control over a larger swath of territory. And this is a telegraph. And then a telegraph, all of a sudden, for the first time in history, you can communicate across the globe in a mere instant. And what used to take months to figure out what was going on could now happen in seconds. So once again, this is valuable for trade, but it's also valuable for coordinating military power.