The Zimmermann Telegram and the sinking of American ships and the British-owned Lusitania (with 128 American lives perished) urged America to mobilize for war against the Central powers. The Zimmermann Telegram was sent by German Foreign Minister Arthur Zimmermann to Mexican Government to suggest that they should declare a war against the US to get back the territories they have lost in the Mexican-American War. However, the British intercepted the telegram and immediately informed the US Government.
Dual Monarchy is basically when two kingdoms are both ruled by the exact same monarch, share the same customs, and follow the same policies and whatnot. It's as if one kingdom had a copy made of itself and is ruled by the same person that rules the original kingdom that the copy was made from, but they're both considered separate kingdoms.
European countries were forced to spend on
those people who were escaping the fighting and seeking refuge.
The Great Depression refers to a
period between the years of 1929 to 1939 when North America and Europe suffered
great economic problems. This is known to be the most lengthy and severest of
the depression encountered by the Western World in terms of economics.
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