This 2018 book reviews the United States' evolving military and economic power since the end of World War II and what the world might look like if American hegemony recedes.

The U.S. became the world's protectorate after World War II, but its role as a world power has been muddled since the fall of the Soviet Union.

Although we have seen the greatest global leap in human rights, prosperity, and peace since the U.S. became the leader of the free world, the American empire is receding.

Robert Kagan is an American political scholar who renounced the Republican Party and became an independent in 2016 in response to Trumpism.

The Jungle Grows Back clarifies the political and military role of the U.S. today and how international and domestic opinions of American hegemony have evolved.

Kagan draws on decades of political access to explore what can be learned from this unprecedented century of peaceful tension.