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The contribution that such newspaper headlines had was (C) The declaration of war against Spain by the U.S. Congress.
The effect of newspapers running such headlines was that the American public began to support a war against Spain.
As a result, the United States Congress eventually decided and voted to declare war on Spain which led to the Spanish - American War.
In conclusion, option C is correct.
Find out more on the Spanish-American War at https://brainly.com/question/10443525.