Which best describes the way historians consider letters and journals?
a)primary source documents that are useful in the study of history
b)reliable sources for the study of history only if from a named source
c)secondary source documents that are useful in the study of history
d)unreliable sources for the study of history because they are too subjective

valentina tereshkova

soviet cosmonaut valentina tereshkova became the first woman to fly to space when she launched on the vostok 6 mission june 16, 1963. valentina tereshkova was the first woman to go into space. in 1963, she spent almost three days in space and orbited earth 48 times in her space capsule, vostok 6.jan 22, 2018

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.