Why did the people in the neolithic age change their form of government

Because people in different environments develop differently and develop accordingly. Especially the start of private property. When agriculture was found to provide a sustainable source of food, or their region is in abundance of food, people settled down. When tehy settled down, they no longer had to carry their belongings. With personal belongings, people wanted power and more belongings. With that, came people lording over other people to also do work for them. Then government was forming to cope with teh pressures of communities, as a leader needed to be concentrated to the task at hand. In the end, you then had monarchs and despots springing up. Elections and things of those type rarely sprang up, but when they did, its because their people had the knowledge base to ponder about life and themselves, as well as rights of subjects.