no one will be able to answer this without context
You didn't list choices, but the two possible answers would be:
<h2>Germany resumed unrestricted submarine warfare.</h2><h2>The Zimmermann Telegram revealed a German attempt to gain Mexico as an ally against the United States.</h2><h2 />
Context/detail:
Public outrage in the US against the Germans swept the nation following the sinking of the British ocean liner, Lusitania, which had happened in May, 1915. When a German U-boat (submarine) sank the Lusitania, 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 two years later, the Germans resumed such attacks. This inflamed public opinion against Germany once again and poised America to go to war.
In addition, British intelligence intercepted and decoded a telegram (known as the "Zimmermann Telegram") that showed Germany was trying to secure Mexico as an ally against the United States. The revelation of this plan inflamed feelings in the United States. The telegram was sent in January, 1917. In March, 1917, German Foreign Secretary Arthur Zimmermann admitted the telegram was, in fact, sent by his office.
In April, 1917, the US declared war on Germany in response to the Germans' submarine warfare and the Zimmermann Telegram.
They prevented the colonies from purchasing or selling goods to Spain or France
Mercantilist thinking characterized British economic strategy. For the goal of boosting British finances at the expense of colonial territories and other European imperial powers, the British Parliament passed measures such as protectionist trade barriers, governmental restrictions, and subsidies to home businesses. A flourishing industrial sector and trade with other European nations were two additional things that England wanted to stop happening in her colonies in North America. The British Parliament passed a number of laws referred to as the Navigation Acts in order to achieve this starting in 1651.
This basically stopped the colonies from conducting business with other European nations. A number of further laws that placed more restrictions on colonial commerce and raised customs fees were passed after this one.
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Because they were looking for a new start and they needed new land and resources.