Answer:
The Department of Homeland Security.
The United States Department of Homeland Security (DHS) is a cabinet department of the U.S. federal government with responsibilities in public security, roughly comparable to the interior or home ministries of other countries. Its stated missions involve anti-terrorism, border security, immigration and customs, cyber security, and disaster prevention/management. It was created in November 2002 in response to 9/11 and is the youngest U.S. cabinet department.
B. New technology gave advantages to Europe
and made them no longer need the safety of the
castles and knights.
Answer: Rocky Mountain Rendezvous. Rocky Mountain Rendezvous (in trapper jargon) was an annual gathering (1825–1840) at various locations held by a fur trading company at which trappers and mountain men sold their furs and hides and replenished their supplies. I would chose the trading answer.