Which of the following is a newer form of mass transit developed in the late 1800s and early 1900s? All of these
elevated trains (els)
subways
streetcars / trolleys​

d. japan's attack on pearl harbor

a.) are both appointed for life

on april 6, 1917, the u.s. joined its allies--britain, france, and russia--to fight in world war i. under the command of major general john j. pershing, more than 2 million u.s. soldiers fought on battlefields in france.