Westward expansion, the 19th century movement of settlers Into the American west opened up Louisiana Purchase and was fueled by the gold rush and the Oregon trail and a belief in “manifest destiny”
The term "Native Americans" is sometimes rejected in some circles due to the Bering Strait theory.
The Bering Strait theory is the belief that no modern group is truly native to the American continents. Instead, 20,000+ years ago, groups traveled across what was then the Bering Strait landmass and settled throughout the Americas.
Some groups, then, prefer the term "First Nations" as it refers to the groups correct heritage as the First Nations to settle the American subcontinents.
Answer: Heritability
Explanation: Heritability could be defined as the degree of variation in phenotypic traits(obseservable physical attributes of an organism which may include appearance, behavior and development) in a population resulting from genetic variation of individuals in that population. It is used in examining how well the difference in genetic traits account for variation in the phenotypic attributes (observed physical characteristics) of individuals within a population.
The variation in estimates for intelligence might be further affected by nutritional differences, quality of school attended, neighborhood stability, peer influence and other environmental constraint.
