In what appears to be an oddity among modern liberal democracies, the United States generally has state legislators draw up federal boundaries. Not only is this a massive violation of the principle of dividing powers, it practically invites redistributing boundaries in partisan manner. Unsurprisingly, this leads to abuse of the boundary-drawing power, and spectacles such as Democratic legislators in Texas fleeing the state in order to prevent Republican legislators from redrawing House of Representative boundaries.

In contrast, a better method would be to have a committee which is at least nominally non-partisan (while you could compose it of political hacks, that might well lead to feuding on the committee). Take, for example, the Canadian experience: the federal boundaries are drawn by committees consisting of a nominee of the Chief Justice of a province, plus two other members nominated by the Speaker of the House of Commons, with the explicit intention of being politically neutral. Similarly, in Alberta, the provincial boundaries are drawn by a chair who is either the province's Ethics Commissioner, Auditor General, the president of a post-secondary education institute, or a judge; two people nominated by the government; and two people nominated by the opposition.

Sure, judges may have political biases, but given that modern liberal democracies already trust them with so many other tasks (read: interpreting constitutions and legislation), if they're going to grind their axes, they've got plenty of other opportunities.