Because there were messages intercepted from Germany to Mexico, telling Mexico to join the war and attack the United States. I hope this helps :)
After the defeat of Russia Japan focus on the expansion of its empire beginning with "China," since this presented them with the greatest potential in terms of harvesting natural resources.
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Queen Elizabeth II is the reigning constitutional monarch over 16 commonwealth realms: in addition to the U.K., the other 15 independent countries include Antigua and Barbuda, Australia, the Bahamas, Barbados, Belize, Canada, Grenada, Jamaica, New Zealand, Papua New Guinea, Saint Kitts and Nevis, Saint Lucia, Saint ...
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