The financial meltdown that started with the bursting of the U.S. housing bubble had worldwide economic repercussions, including recessions, far-reaching regulations, and deep-seated political discontent. Track its buildup and aftermath.

Since the creation of the European Union in 1992 and the subsequent launch of the euro, Greece’s economic relationship with the rest of Europe has been a turbulent one. Greece’s chronic fiscal mismanagement and resulting debt crisis has repeatedly threatened the stability of the eurozone.

The Somalia-based Islamist insurgent group al-Shabaab has proved resilient, committing brazen terrorist attacks at home and abroad despite strategic setbacks in recent years.

Since Fidel Castro’s ascent to power in 1959, U.S.-Cuba ties have endured a nuclear crisis, a long U.S. economic embargo, and political hostilities. The diplomatic relationship remained frozen well b…