Which of the following most accurately describes the relationship between Native Americans and settlers?
1) They lived in peace, with many settlers marrying and living among Native Americans.
2) The relationship was violent, as Native Americans frequently attacked unarmed settlers.
3) Native Americans were very reluctant to fight against the U.S. Army, so they quickly moved westward.
4) The relationship was tense, as the settlers' westward expansion led to fighting between the two groups.