The British Empire declared war on the German Empire on 4 August 1914. The declaration was a result of German refusal to remove troops from neutral Belgium. In 1839 the United Kingdom, France, and Prussia (the predecessor of the German Empire) had signed the Treaty of London which guaranteed Belgium sovereignty.
The separate colonies formed a tighter and tighter unit because they didn't want to be apart of British rule anymore, and all shared similar ideas which brought them together over time. They did not believe in the taxation and British control that they were experiencing especially when they had no say in British parliament. The Boston Massacre was a huge turning point in uniting the colonies, as that is when all of them realized they wanted their own independence away from Britain. They also realized that strength was bigger in numbers and if all of them were together they could break away from Britain's rule more quickly and effectively.
I believe that the answer to the question provided above is because of industrial revolution US shipping industry flourish in the late 1700's
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