What is the primary role of the United States Bureau of Counterterrorism? A to plan counterterrorist attacks
B to create active counterterrorism groups
C to encourage domestic counterterrorism activities
D to advance counterterrorism efforts in other countries

an expansion is one of two basic business cycle phases; the other is contraction. the transition from expansion to contraction is a peak, and the changeover from contraction to expansion is a trough.

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.