That should be the Darling River so B.
The two reasons:
- Britain intercepted the Zimmerman Telegram
- Germany resumed unrestricted submarine warfare
Context/detail:
Public outrage in the US against the Germans swept the nation following the sinking of the British ocean liner, <em>Lusitania</em> -- but that happened before 1917. When a German U-boat (submarine) sank the Lusitania in May, 1915, over 1,000 persons were killed, including more than 100 Americans. The passenger liner was targeted by the Germans because they suspected weapons were being shipped to Britain in the cargo hold of the ship.
Germany managed to stave off American entry into the war at the time by pledging to stop submarine attacks. But a couple years later the Germans resumed unrestricted submarine warfare, and there was also an intercepted telegram (the "Zimmerman Telegram") that showed Germany was trying to secure Mexico as an ally against the United States.
In 1917, the US declared war on Germany in response.
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Scientists got information for <span> the </span>geologic time scale<span> by studying rock layers and index fossils worldwide.With this </span>information<span>, </span>scientists<span> placed Earth's rock layers in order by relative age. Later, radioactive dating helped determine the absolute age of the divisions in the </span>geologic time scale<span>.</span>
