Slaves worked for free and had to do all hard labor that they were told to do.
1) B
2) B
Would be what I'll pick.
"The following month, Germany sunk four more U.S. merchant ships. ... On April 6, 1917, the United States entered World War I. Get a firsthand look at how a new breed of weapons like WMDs, submarines, armored tanks and air attacks changed modern warfare forever in WWI: The First Modern War"
A. Modernism is the answer
