Because democracies and authoritarian regimes are like oil and water.
Authoritarian regimes will inevitably attempt to expand because authoritarian leaders view the existence of people they don't rule as a threat towards their rule and they inevitably desire to grow their control and power over more and more people.
> Authoritarian regimes will inevitably attempt to expand
Which is ironic that most of the annexation talk came from the US in the recent times, not from China. Canada, Greenland, Panama Canal, Mexico what else has he threatened to annex?
Authoritarian regimes will inevitably attempt to expand because authoritarian leaders view the existence of people they don't rule as a threat towards their rule and they inevitably desire to grow their control and power over more and more people.