Answer:
Systematic observation.
Explanation:
Systematic observation is a form of observation that requires a list of specific actions, characteristics and variables that need to be considered within the observation. The observers will record any changes that occurred within this list to the outmost details.
This is how systematic observation created a strong data to support the decision made through that observation. Typically, systematic observation would be one that is used in most scientific researches.
The third amendment gives the right to Americans who own their home to reject military troops to enter there home without permission. this was a problem back in the late 1800's with troops staying in the citizen private home by force. so it helps protects the citizen from having to take in a troop from the army
Historians have to be careful about the terms they use because those terms meant different things in the past
All of the above would be why the Louisiana Purchase would be important.
