Why is democracy so inportant in america

Democracy is based on freedom and equality between all people.

Extra on why: It’s often described as the ‘rule of the majority’, as important decisions are based on the votes of the people. This can either be:

Through direct democracy. Everyone gets the chance to vote on the outcome of a decision. An example is the Brexit referendum in 2016.
Through representative democracy. People vote to elect officials to make decisions to reflect the wishes of the people, such as the US Congress and UK Parliament.