Either way, the fundamentally balanced House map is the backdrop to the new Texas map. While a few more Republican seats will certainly help the G.O.P., it will take more to give Republicans a major structural advantage in the fight for the House.

Republicans in Texas currently hold 25 of the state’s 38 seats, and the new map ups the total they could win to 30. All of those new 30 seats were won by Trump in November by at least 10 percentage points, leading to conservative optimism they can hold them even in what’s likely to be a tough midterm environment for the party.