We are the United States of America. We are not simply America.
Power is balanced between the state and federal governments by design.
The electoral college grants each state a minimum of three seats (one for each senator, plus at least one for your reps).
As much as I like our neighbors in California, I do not want to live under a tyranny of the majority of the most populated states.
Complain all you want, but it would take a lot to try to get rid of a system which ultimately preserves what many people want — the sort of local control you do not find in most other nations.