So, the core of the study is the behaviour and personality - and this is usually studied by psychology. Therefore we can guess that we are looking for a branch of psychology.
This branch is social psychology - it focuses how the society (social environment) influences this behaviour.
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Answer:
By Doing it this way, we allow the American People to have more of a say. This keeps them happy in the US, and prevents repeats of the Revolutionary War. When the people choose their leaders, they can hope that the leaders have the people on their mind
Explanation:
The U.S used the Texas-Mexico border dispute to annex Texas as a state and gain more land from Mexico. Basically all the land that Mexico owned in North America was given to the U.S after the U.S defeated Mexico in the war.