The type of research design which compares various participants at several points in time (no longer than 6 years apart) to examine age-related differences and changes is called a

Cross-sectional research

Explanation:

Cross-sectional research: The cross-sectional research or study is also referred to as prevalence study, transverse study, and cross-sectional analysis.

This is one of the types of observational studies that examine a representative subset, population data, at a specific time. It includes people who belong to a different group but shares few characteristics like, educational background, socioeconomic status, and ethnicity.

the best and most correct answer among the choices provided by the question is the second choice "less supportive to the war of 1812"

the war of 1812 was a military conflict that lasted from june 1812 to february 1815, fought between the united states of america and the united kingdom, its north american colonies, and its native american allies.

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