Name Class Date Free and Slave States Following the Missouri Compromise in 1820, states were admitted to the Union as either free states or slave-holding states. As new states joined the union, there was a national debate over whether these states should be free states or slave states. The Compromise of 1850 was passed to determine how the issue of slavery would apply to land gained following the Mexican War. MAP ACTIVITY 1. On the map, label the state of Texas. 2. Label the state of California. 3. Use a light color to shade the areas where the issue of slavery was decided by pop- ular sovereignty. 4. Use a bright color to shade the slave territories south of the Missouri Compromise line. ANALYZING MAPS 1. Place Which territory is directly north of Texas?