I'm pretty sure the US felt personally involved because of the sinking of the Lusitania. the ship was torpedoed by a German u-boat and 114 American passengers aboard the ship lost their lives.
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No
yes and so did Australia, France, Germany and America and many other countries involved
Spain was not involved in World War 2. They were neutral
America fought on the Allied side during both World Wars and now they are one of the major Western Powers.
Yes, it had been invaded by Germany.