30 points

a. a historian could use this source to learn more about how foreigners traveled in china at this time,
b. a historian could use this source to learn more about what the chinese thought about foreigners
c. a historian could use this source to learn more about the shanghai government .
d. a historian could use this source to learn more about the chinese christian community

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d. it adversely affected american productivity

the most famous of all the units fighting in cuba, the "rough riders" was the name given to the first u.s. volunteer cavalry under the leadership of theodore roosevelt. roosevelt resigned his position as assistant secretary of the navy in may 1898 to join the volunteer cavalry. the original plan for this unit called for filling it with men from the indian territory, new mexico, arizona, and oklahoma. however, once roosevelt joined the group, it quickly became the place for a mix of troops ranging from ivy league athletes to glee-club singers to texas rangers and indians.

d.

the northwest territory became the most densely populated area in the u.s.