D. (on USA Testprep).....<span><span><span><span>American youth became active in trying to change the culture and government policies through voting and other measures. </span></span></span></span>
If I understand your question correctly, you want to know who the last (as of today) "white" president was of the US? It was George W. Bush, president until 2009.
D. Because loyalists sided with the British government
