United States and Spain that divided their North American claims along a line from the southeastern corner of what is now Louisiana, north and west to what is now Wyoming, thence west along the latitude 42° N to the Pacific. Thus, Spain ceded Florida and renounced the Oregon Country in exchange for recognition of Spanish sovereignty over Texas.
I believe the answer is Observational study
In an observational study, the data input couldn't be controlled by researchers because it's relative to the subject.
This type of study usually being conducted in researchers that involve ethical measurement or Personal opinion.
Answer: c. neither the subjects in the experimental or control groups nor the experimenters know which are the experimental and control groups
Explanation:
A double minded study could be described as one where both the party carrying out the experiment and the perty involved in the experiment do not know themselves. The researcher has no idea with whom they are interacting with. They just perform function and go their way. The purpose of the study is to eliminate suggestion among pratitioners.
Answer:
map out the Mississippi river
