Why do Americans avoid a simple grid to divide their voting districts and public elections?

Around 60% of the county do not like Republican policies. 70 to 80% of gun owners agree there should be more regulations on guns. If everyone's vote was counted the Republicans would not win elections so they do absolutely anything, legal or not, to prevent Democrats from voting. Gerrymandering, Suppression, Vote Harvesting, removing voting stations, creating all day lineups on the hottest days, making laws that prevent people from helping people in line, even preventing giving out water, allowing people to supervise these lines with rifles, signing students up to vote in the summer when they are not at school, not allowing people with similar names to vote, not allowing an Indian Community to vote because they get their mail at mail boxes rather than at a residence, trying to stop mail in ballots, etc, etc,etc.