What factor contributed to the growth of the middle class in the late 1800s?

answer: b.

explanation:

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

if i am correct the answer is going to be a) the federal program of reconstruction ended.