Metalloids are metallic-looking brittle solids that are either semiconductors or exist in semiconducting forms, and have amphoteric or weakly acidic oxides. Typical nonmetals have a dull, coloured or colourless appearance; are brittle when solid; are poor conductors of heat and electricity; and have acidic oxides.
(1860-1948).At the age of 56, John J. Pershing became the commander of the American Expeditionary Force that helped to turn the tide in favor of the Allies and against the Central Powers during World War I. For his leadership during the war, he was promoted to the rank of general of the armies.
General John J. Pershing, the commander of the newly designated American Expeditionary Forces, arrived in Paris in June 1917, two months after the United States entered the war.age 22. A perusal of the volumes of Military Operations in the Official History of the American Expeditionary Forces impresses the reader with just how far the organization progressed in its capabilities and efficiency in a relatively short time.