This command starts the integration process of one country into another. If the two specified countries are already integrating, this command will instantly complete the integration process.
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The above command would start the integration process of France (FRA) into your current country. If the integration process has already started, this would complete it instantly.
integrate FRA ENG
This example is the same as the first, but as we have specified England (ENG) a second country tag, France would be integrated into England rather than the country you are currently playing as.