The U.S. government responds to scores of disasters each year in coordination with foreign, state, and local partners, but more frequent and severe storms, fires, and floods are straining resources.

Brazil has long sought a greater role on the world stage, but political upheaval and other enduring challenges have complicated its efforts.

Responsible for powering the country and its economy, the U.S. energy grid has come under increasing strain due to climate change, and the threat of cyberattacks looms.  

The U.S. Navy’s dominance of the world’s oceans has made it an indispensable foreign policy tool as well as a guarantor of global trade, but a mix of challenges is raising difficult questions about i…