Sentence:  Fear of Japan, resulting from the contrast between the sparsely settled American and the thickly settled Asiatic shores of the Pacific Ocean and from the knowledge that the Asiatic exclusion policy has aroused great Japanese ill-feeling, and jealousy of Chinese and Japanese inhabitants of the U.S.A., resulting from their hard work, thrift, and skill, which enable them to <WSD>underlive</WSD> Americans of European origin, are political factors of importance in the Pacific region. 
Meaning of the word marked with <WSD> tags:  To live on fewer resources than (someone).