the answer is caste system
South Vietnam's President Diem (which is who I'm assuming you're talking about) was overthrown in a military coup. Following the overthrow of his government by South Vietnamese military forces, President Ngo Dinh Diem and his brother are captured and killed by a group of soldiers. The death of Diemcaused celebration among many people in South Vietnam, but also lead to political chaos in the nation.
A) D) & E) The transcontinental railroad needs more historical credit
Answer:
John Smith
Explanation:
1607, May: About a week after establishing Jamestown, Captain Newport led a group of 23 men, including John Smith, George Percy, and Gabriel Archer on an exploration up the James River.
Answer:I
If you mean by 21st century then, having awesome medical people
Explanation:
A lot of contries don't have a lot of medical staff, but the US has hired very good medical staff.