Official websites use .gov A .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPS A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites. National Park Service Search Exiting nps.gov Rate the Lesson Plan Distance Learning Frontier Life in the Texas Hill Country Grade Level: Upper Elementary: Third Grade through Fifth Grade Subject: Social Studies Common Core Standards: 4.RI.1, 4.RI.3, 4.RI.5, 4.RI.7 State Standards: Texas Essential Knowledge and Skills fo