Gerrymandering is an American tradition that has been around since Governor Gerry (look it up). Like the Electoral College, it’s a great way to make sure the will of the people is ignored.
In some states, they have passed laws to prevent it as much as possible by keeping politics out of it.
Anyway, a new study has been done which shows what the last election would be like if all states used that procedure. Surprise! The Democrats would have won the House. OK, it’s not really a surprise, because more people voted for Democrats in the House races than Republicans.
Check out this study. Yes, it’s on a liberal blog, but the math looks good.