World War I. Main article: U-boat Campaign (World War I)
See also: Mediterranean U-boat Campaign (World War I)
<span>Submarine warfare in World War I was primarily a fight between </span>German<span> and Austro-Hungarian U-boats and Atlantic supply convoys bound for the </span>United Kingdom<span>, </span>France<span>, and </span>Russia<span>.</span>
Okay I only know 2 things: The sinking of the Lusitania and Zimmerman Telegram. What started the war the ruler of the ottoman empire was assassinated and what expanded the war was the Zimmerman telegram.
<span>On Sundays the military relaxed discipline
somewhat, allowing soldiers and sailors to go on leave for the weekend,
or to sleep in an extra hour in the morning.</span>
Most slaves that were sent to the Caribbean ended up working sugar plantations, since sugar was in incredibly high demand in Europe, making it very expensive and profitable.
