Here are the answers to your multiple-choice questions:
Question 14: The treaty to which Card is referring was written to address what global problem?
- greenhouse gases
Question 15: The person who was put to death for the 1995 bombing of a federal building in Oklahoma City had once been a member of what organization?
- the United States Army
Question 16: What was one of the consequences of implementing airport security inspections?
- Traffic fatalities increased when people chose to drive rather than fly.
Question 17: Why did Powell say in 2005 that this speech would always be a "blot" on his record?
- The intelligence information that he presented in the speech turned out to be false.
Question 18: Which country has contributed the most to the foreign-born population of the United States?
- Mexico
Question 19: Which phrase characterizes U.S. immigration policy since the 1990s?
- focused on border security
Question 20: Which statement describes how the immigration debate in the United States was shaped by the terrorist attacks of September 11, 2001?
- The attacks reduced public support for open immigration laws.
If you have more questions or need further explanations, feel free to ask!