Latin Americas and Scandinavians are more likely to be chipper than, say, the Chinese or the Iraqis (of course, there are very real non-genetic reasons for their respective unhappiness too). Is it possible, then, that as more Hispanics intermarry and intermingle and inter-you-know-what, they will spread their happiness genes among more and more Americans?
King was a radical. He challenged America's class system and its racial caste system. He was a strong ally of the nation's labor union movement. He was assassinated in April 1968 in Memphis, where he had gone to support a sanitation workers' strike. In his critique of American society and his strategy for changing it, King pushed the country toward more democracy and social justice.