Which was not a way in which us boundaries changed between 1800 and 1821

When conducting research for forming a hypothesis, which practice should historians follow?

What caused the comanche kiowa raiding? a. gadsden purchase b. battle of alamo c. bear flag revolt d. settlement of texas

The discovery of hammurabi's law code was an important archaeological find because it a. was the first law code developed in the middle east b. showed that early mesopotamian cultures had a bill of rights c. is the most complete mesopotamian law code known d. provided a model for european law codes