Leif Erikson died in the year of 1020
Answer:
This type of research is an example of the research method called cross-sectional research.
Explanation:
Cross-sectional research is a research design or method used in observational studies. The reseracher measures the dependent variable in different population groups at the same point in time. The population groups or cohorts are chosen depending on the research question, they can be based on age (like in the example in the question), gender or race, among other categories. Usually the outcomes are compared to one another.
The 3 Requirements are:
1. Must be a natural born citizen
2. Resident for 14 years
3. 35 years of age or older
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United states had entered the conflict in vietnam as the worlds
superpower following its decisive victory over the axis power in WWII but left vietnam with a defeat american public sharply divided and its leaders uncertain of what lay ahead in foreign policy's
