Every imperial project, no matter how great, eventually meets its downfall. In fact, you may be reading this in a country that was once part of a now-vanished international superpower. Here are maps that reveal the rise and fall of the world's most ambitious empires.
In 1856, seabird guano was an in-demand fertilizer, so the the United States Congress passed The Guano Islands Act. This legislation was a precursor to American imperialism, as it allowed citizens to claim bird-crap-covered islands in the USA's name.
Pop culture has an important message for you: When we finally meet an alien race, whether they're cute blue cat people or garbage-eating Prawn people, we'll oppress the hell out of them. So what kind of oppressor will you be?
I really want to like Battle for Terra, the 3-D animated movie where survivors of a destroyed Earth argue over whether to conquer the way-too-cute peace-loving aliens. But this new trailer makes it really hard.