Ezekiel Dean's "The End" is a list of endings, each one bigger than the last. It starts with the end of a life, then widens to the end of the world, of war, of fighting, and even of "all black" and "all white," which could mean racial divisions, or simply a world reduced to nothing. Even emotion and time are switched off. The repeated "The end of..." works like a drumbeat, and the short, rhymed lines make it feel steady and final, almost like a countdown.
The mood is bleak and heavy for most of the poem, but the last two lines change the angle. "It's the end of your world / And the beginning of mine" suddenly makes the speaker a person, not just a voice announcing doom. The speaker seems to be talking to someone else, and the poem may be about a breakup or a loss that frees one person while crushing the other. That reading is an inference, but it would explain the cold, almost relieved tone at the close.