Problem: The category of Native American applies to the diverse group of people who lived in North America before European settlement. During the U.S. government's westward expansion, Native Americans were displaced from their land which had been their home for centuries. Instead, they were forced onto reservations which were far smaller and less productive. According to Brest, land belonging to Native Americans was reduced from 138 million acres in 1887 to 52 million acres in 1934. In 1990, the poverty rate for Native Americans was more than triple that of the whites and only 9.4% of Native Americans have completed a bachelor's degree as opposed to 25.2% of whites and 12.2% of African Americans.
Where were Native Americans forced to live after they lost their land?
The answer is the following: reservations

Problem: On January 10, 2007, the National Archives and Fold3.com (formerly Footnote) launched a pilot project to digitize historic documents from the National Archives holdings. Allen Weinstein explained that this partnership would "allow much greater access to approximately 4.5 million pages of important documents that are currently available only in their original format or on microfilm" and "would also enhance NARA's efforts to preserve its original records."
What was the aim of the partnership with Fold3.com?
The answer is the following: to digitize historic documents from the National Archives holdings

Problem: For fortification, however, a 2003 review recommended zinc oxide in cereals as cheap, stable, and as easily absorbed as more expensive forms. A 2005 study found that various compounds of zinc, including oxide and sulfate, did not show statistically significant differences in absorption when added as fortificants to maize tortillas. A 1987 study found that zinc picolinate was better absorbed than zinc gluconate or zinc citrate. However, a study published in 2008 determined that zinc glycinate is the best absorbed of the four dietary supplement types available.
In what product did various compounds of zinc show little difference in absorption?
The answer is the following: maize tortillas

Problem: Being one of the four ancient capitals of China, Nanjing has always been a cultural centre attracting intellectuals from all over the country. In the Tang and Song dynasties, Nanjing was a place where poets gathered and composed poems reminiscent of its luxurious past; during the Ming and Qing dynasties, the city was the official imperial examination centre (Jiangnan Examination Hall) for the Jiangnan region, again acting as a hub where different thoughts and opinions converged and thrived.
When did the city serve as the official imperial examination centre?
The answer is the following:
the Ming and Qing dynasties