Encarta says in 1900 NYC, Chicago & Boston, 1,170 of these were powered by steam, 800 by electricity & 400 by gas
[DOC] [TLE] The American Empire - Wade Frazier [PAR] Sumer declines as a power, and the center of Mesopotamian civilization shifts 
...... Columbian Exhibition in Chicago, celebrating 400 years of European ..... 
Vikings began their disastrous invasions of Europe in about 800, conquering ......