In seventy years, the U.S.-South Korea alliance has evolved from a patron-client relationship to a global comprehensive strategic alliance.

The Democratic Republic of Congo has been subjected to centuries of international intervention by European powers, as well as its African neighbors. This timeline traces the role of the outside forces that have beleaguered eastern Congo since the end of the colonial era.

Negotiations between the United States and North Korea have proceeded in fits and starts for decades. But they have failed to halt the advance of North Korea’s nuclear and missile programs.

Since India’s independence, ties with the United States have weathered Cold War–era distrust and estrangement over India’s nuclear program. Relations have warmed in recent years and cooperation has strengthened across a range of economic and political areas.

Since 1992, negotiations have produced notable accords on climate change, including the Paris Agreement. But leaders have so far failed to slow global warming. Trace the successes and failures of UN climate conferences ahead of COP26.