The answer is B. Germany's invasion of Poland.
The Seattle longitudinal study of cognitive development discovered that among older people (d.) higher socioeconomic status is associated with higher levels of intellectual functioning. Interacting socially and economically is a great factor in keeping up your intelligence up to date.
A) A fort was established and many were killed by diseases
Lewis and Clark's expedition was not positive to the native of Mandan village the most devastating epidemic was the smallpox outbreak in the year 1837 killing a lot of people. The epidemic played an important factor in uniting the surviving Mandans and Hidatsa who later engaged in trade, farming and hunting.
1. Immigrants settles in large cities and brought cultural diversity
2. The lack of women's voting rights
3. Plantation system
4. Voting rights
5. It increased the number of immigrants seeking refuge
