What limits does archeological evidence have as a historical source?

Limits archeological evidence has as a historical source:

1. Artifacts are difficult to date and must be analyzed.

2. They are mostly based on a guess/assumption.

3. Due to the lack of real use visualization

4. Inaccurate placement.

wilsons 14 points

hope i

answer; i believe the correct answer is (the willamete valley);