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For the positive maybe the USA in all its area, was able to help the UK in the World Wars, more than the territory the UK and Spain controlled IOTL USA in 1774, the last full year before the WOAI, would have.

For the negative maybe the American Revoloution inspired the French Revoloution which led to the extreme nationalism of Germany and the Russian Revoloution.
Do away with American independence, and maybe Germany remains as divided as it was in 1774, no World Wars, no Russian Revolution.

And maybe well before OTL WWI the UK takes and digests the Spanish territory of OTL USA along with Alaska and maybe its as useful in the struggle that way as it was IOTL, if there is a struggle.
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