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 Field Trips Native American Tree and Plant Gathering: Commemorating the Trail of Tears Grade Level: Upper Elementary: Third Grade through Fifth Grade Subject: Social Studies State Standards: Social Studies: 3.4 3.6 3.7 3.11 4.2 4.3 Science: 3.10 4.5 5.9 6