Political changes are perhaps the most common way to enact change in a nation, because these changes almost always bring about social and economic changes.
Like crippled or to give in to something
Rulers that seize power via coup or revolution are dictators
Single party rule of everyday life is Totalitarianism
Theocracy is rule based on Religion
Nobility through parentage and divine right is Monarchy
Oligarchy is the rule of the powerful and rich