For nations, size matters.

The United States can afford aircraft carriers; Costa Rica cannot. The more populous a nation, the lower the cost per taxpayer of highways, schools, and public safety. The more domestic consumers, the larger the scale of markets unfettered by trade barriers. The larger a nation's economy, the greater the diversity of jobs available to workers.

But greater size comes at a cost: the more people, the more potential for conflict. This trade-off between the benefits of size and the potential for conflict often determines whether a nation succeeds-or fails.

Since WWII, most nations in which the advantages of size were outweighed by the disadvantages of internal strife have split apart. As a result, the number of nations in the world has exploded from 74 in 1945 to 196 in 2022. But some large countries today remain "too big."

Nations that fail to rightsize will suffer from increasing social turmoil and political violence in the years ahead. These countries risk civil war or the rise of authoritarian leaders from both the far-right and far-left who promise to bind a nation together by force.

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