That could definitely be argued! The WWI was fought in Europe, so many European countries were left in pieces at its end. So they were definitely in need of outside support. One may also look at it from another point of view. The US refused to join the League of Nations, which shows that the country was not necessarily as involved in world affairs as it could have been.
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The north and the south differed in a couple of ways in the mid 1800's, economically and socially which contributed to a rise of regional populations with contrasting values, ideologies and visions for the future. The differences includes; vast industry and immigration in the north, established agriculture in the south and slave trade carried out in the south.