HUNTSVILLE, Texas — Huntsville has long been a city defined by its history. Sam Houston lived here. The Texas prison system established deep roots here. Sam Houston State University grew into one of the region's most important institutions. But the Huntsville of 2035 may be defined less by its past than by what is being built today. Across the city, signs of change are becoming increasingly difficult to miss. New homes are being constructed, restaurants are announcing locatio