Wars of ancestors on land

Land is very important cause we need to build houses but many created wars so they can obtained that land but the problem is that when we try to do this ,we create sins that GOD will be angry which can make you commit PRIDE and ENVY but in the times of our ancestors they create Spears from stones or Obsidian so they can hunt we would walk with a group of many families but some rebell because of the leaders do not want to share with the land or with food