From what I read in my own textbook, it is A.
A term<span> formerly used to </span>refer to<span> persons born of one </span>white<span> parent and one </span>black<span> parent</span>
America got involved in WWI because Germany attacked a US ship that was going to Britain.
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When World War 1 broke out across Europe in 1914, President Woodrow Wilson proclaimed the United States would remain neutral, and many americans supported this policy of nonintervention.
A) Regulation of the meatpacking industry