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I hope you are talking about the actual World War 1.. The way I see it, the pros are:

  • A larger fighting force.
  • Countries allied to another would have felt obliged to have a long term relationship with its allies.
  • Help with supplies and weapons.

The cons:

  • A country might have gotten allied to a country that was previously an enemy, but the other allies were friends with them. This could have caused some uncomfortable politic situations.
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14y ago

What else can I help you with?