Harriet tubman was a leader of the abolitionist movement. in which time period was she most active?
a) 1810s
b) 1830s
c) 1850s
d) 1870s

Correct  C) 1850s

Details:

Harriet Tubman was  an escaped slave. who had been held in slavery in Maryland.  She escaped to Philadelphia in 1849 ... but then went back to rescue her family and help them to freedom.  Then she helped extended family members, and eventually was helping many, many slaves to freedom on what became known as the "Underground Railroad" -- a secret network of routes from one safe house to another that aided slaves in their escape.  During the 1850s, Tubman directly helped dozens of slaves escape to the North, and provided instructions for escape to dozens more beyond those.

i'd assume india mainly because of how isolated japan was.   plus it is a whole china away.

c) troops march forward in close formation against newer, more accurate weapons