U-boats were military submarines used by the Germans. While they were useful against warships, U-boats were the most effective in economic warfare by blockading coasts so resources could not be shipped to Germany's allies. WWI was the first major war that employed submarines in warfare.
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The answer is letter A. The California Alian Land Law of 1913 prohibits foreigners from owning lands, stocks and other properties. They were also not allowed to lease them for more than three years of tenure. Many Chinese, Indian, Japanese and Korean immigrant farmers were deeply affected of this law. This law was implemented to stop foreigners from immigrating, specially Japanese immigrants and to create an inhospitable climate with the other immigrants in California. Around this time, there was an on going Anti-Asian prejudice going on causing the implementation of this law.
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But probably the most notorious German variation was the saw-back bayonet. A double row of teeth on the on the back edge of the blade was designed for sawing. For allied propaganda, this was a blessing, as they were able to present the German army as a bloodthirsty 'huns
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