It does nothing but create gridlock,
It's supposed to create gridlock. Gridlock means laws typically can't get passed without broad agreement or compromise between the House, Senate, and the POTUS. That means it's usually pretty hard to pass bad federal laws or ones a large # of voters or states dislike, and by chance they do the House of Reps and a bunch of senators are up for reelection every 2 years.
In Canada 40% of the electorate can vote a majority party into power that has the ability to decide all of the bills while the other parties can just sit and ask questions. And then there's a stark hierarchy within that majority party itself on who decides what.
and disenfranchise the majority.
At the cost of possibly disenfranchising the states? The USA is a union of states, it's a federation. It's not simply 300 million and majority rules.