With surgical precision, Republicans draw two congressional districts that dilute power of Hispanic and Asian voters

The intensity with which Texas Republicans are struggling against demographic tides as they redraw the state's congressional districts can best be seen in their proposed maps for the Dallas-Fort Worth region, specifically its suburbs.

For decades, suburban communities offered the GOP solid political ground. But census figures demonstrate the state is growing away from Republicans, with nearly all of its population gains coming within communities of color more likely to support Democrats.

That shift has reached the suburbs. In a bid to hold the political turf, Republicans are zeroing in...