I wish america just chose the metric system in the beginning
Why do you prefer the metric system?
I just think using it would have saved Americans money and power.
While it is fine to believe that if thing had gone differently in the past the world would be better off now, there is no use obsessing over things you can't change. Your time is better spent thinking about things in your life that you can change, instead.
I thought it would have made the world better. But you're right. There's no use complaining about it.
That's good that you can move on from that. If you want, you can still use the metric system too.