According to Gwynne, what led to the fall of the Apache as the dominant Native American force in the 1700s

are these the benchmarks questions?

2018 means 2018 ce or common era

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

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)