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What are some pre-1900 (so no talking about the World Wars) ways to get the global population significantly higher (whether it be through better medical practices, introduction of new crops to the region, higher immigration, incentives for having more children, or whatever is reasonable) than it was IOTL.

Bonus points for detail and if these regions can have more people living there:
  • non-Russian or Austrian Eastern Europe
  • American Midwest and inland West post-1850
  • Pre-British/European New Zealand
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