We used to have tons of restrictions on voting. If only white, land-owning men were allowed to vote today, things would be fine.
The problem arises when lower quality voters start complaining. They ask for voting rights, and they will eventually get them. Voting rights are often given, and NEVER taken away. Niggers could ask for voting rights to be granted 100 times, and all it would take is 1 successful vote to permanently enfranchise them. Same for women. It's tempting to just say "we need to restrict voting rights to the groups the founders wanted!", but all you're really doing there is kicking the can down the road by a few decades. The root problem is that voting is a retarded way to determine anything, let alone the policies of a nuclear superpower.
TL;DR- If white, land-owning men were such great voters, women and niggers never would've gotten the vote.