U.S. Presidents Trump and Biden have both turned to tariffs to support local industries amid economic confrontation with China. Here’s how these taxes work and how they’ve been used historically.

Artificial intelligence will transform how wars are fought.

Trade between the world’s two biggest economies has ballooned in recent decades, bringing significant benefits but also perils that have led to calls to rethink the relationship.

The sprawling U.S. water system is central to the nation’s economy, but chronic underinvestment, increasing demand, and the consequences of climate change have revealed the system’s weaknesses.