As warmer, wetter weather was beginning to take hold, rising sea levels swamped the coastal regions. Forests replaced open woodlands and grasslands. The Ice Age was ebbing. As habitats disappeared, so did mammoths.
Whether the general mammoth population died out for climatic reasons or due to overhunting by humans is controversial. A combination of climate change and hunting by humans is the most likely explanation for their extinction.
Take heart! You can still see Mammoths at Dinosaur World in Kentucky!