The answer is D because of the emotion.
Answer:
In the 19th century (before as well as after the Civil War), railroads brought many changes to the United States of America. For one thing, trade and commerce increased, with a complementary expansion of industry, especially in the North. For another, settlement of the 'wild West' was made easier, as was increased growth of areas already settled. For yet another, military operations became more sophisticated and generally more power-packed: during the Civil War, Union and Confederate forces could be quickly reinforced or moved to areas of special need due to the rapid transportation provided by railroads.
I think the answer would be a
A. Bus boycotts in Montgomery, Alabama
D. Ratificación of the 13th, 14th, 15th amendments
"marriages are good when one party is white and the other person and other is possessed of one eighth or more negro, japanese, or chinese blood."
" separate free schools shall be established for the education of children of African descent; and it shall be unlawful for any colored child to attend any white school, or white child to attend any colored school."
