Here’s the 5-yr-old version: Our brains are way more advanced than other animals, even chimps (who have the closest brain to ours). Since we can learn way faster, make complicated decisions and plans, and have conscious thoughts (we know who we are, we can differentiate bw others, we reflect on our decisions, we have a moral compass, we make decisions depending on our changing environment and learn from those decisions), we were able to start and expand our communities. We built tech, started a barter system (trading items) with people all over the world, and created towns/villages/cities/countries with governments. Since we can have conscious thoughts and have a moral compass, we also have bigger desires than just having babies/eggs and finding food (like many other animals). We want to have fun, we want to feel like we are helping society, we want happy relationships, etc. All of this helped us advance over time from small city states to big countries that have governments, armies, trading partners, etc.
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