Will there be a war between two or more democratic countries before 2072?

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• Will there be a war between 2 or more EU states before 2153?

The Democratic Peace Theory suggests that democratic countries are unlikely to go to war with other democracies. Proponents of the Democratic Peace Theory argue that it has been a key factor in preventing wars from breaking out in parts of the world that have a high concentration of democracies, such as Europe and North America. Opponents argue that numerous wars between democracies have occurred in the past, and that issues defining which conflicts can be considered wars and which nations can be considered democracies undermine the validity of this theory, among numerous alternative explanations for it.

Since 2006 the Economist Intelligence Unit (EIU) has published the Democracy Index, which scores and categorizes regimes according to their assessment of their measure of democracy. As of December 2022 the latest release is the Democracy Index 2021 published on February 10, 2022. The 2021 edition rates 167 countries, noting that micro states were excluded.