Well, back in the day, (and still to this day) Texas had a very good quantity a natural resources. (Including oil and many others)
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Direct Observation, Indirect Observation, Random Sampling and lastly, Mark-and-recapture study.
Answer:
Try making a checklist or schedule for the day, it motivates you to do more things in order to tick things of, it also keeps you organised and can help you prioritise certain things, but try to leave space for some relaxation of some sort. take notes in lectures as they may come in handy later and don't be scared to ask professors for help or to elaborate on the task that they have asked you to do
Because the south depended on slavery for their economy and the north was more industrialized so they had no need for slaves so they saw slavery as something bad