"All men are created equal" means that every person is the same when they are born. It doesn't matter what their color, their nationality, or their religion is. Everyone has the same rights as anyone else. They all deserve to be treated in the same way and with respect.
Just like when you play with your friends, everyone should have the same chance to play and have fun. Nobody is better or more important than the other. It is the same with being born - no one is more special or better than someone else.
This also means that every person has the right to be happy, healthy, and safe. Nobody should be treated differently because of who they are. We should all try to help and support each other to make the world a better place.