Answer:
qualitative ; quantitative research
Explanation:
Qualitative Research is research that is based on the observation and interpretation of the investigator by his or her understanding of different reasons and opinions and not measured. Even though much more less structured than Quantitative, it helps to decipher changing trends in thought and opinions, and delve deeper into the problem. Qualitative data collection methods include focus groups or discussion individual interviews, and participatory observations. The respondents for this research are relatively small and selected per research.
Quantitative Research is descriptive and used to quantify the problem by way of generating and gathering random data which can be transformed into analysed statistics. It is used in analyzing attitudes, opinions, behaviors, and other variables and obtaining results from a wide sample population. it helps to formulate facts and uncover patterns in research using data that can be measured. The collection methods here are more structured and the collection methods include different forms of surveys ( online or direct ) interviews , polls and systematic observations.
a) Slavery increased in the South due to the economic gain of cotton
Growing more cotton meant an increased demand for slaves.
