All chang 18. George Stephenson was a British Inventor and engineer who designed many of the first railroad tracks. How did Stephenson's work contribute to the success of the railroad system?
He build his tracks using a type of steel that would last a long time because of the proportion of iron in the rails,
He worked with locomotive designers to ensure the the trains would run smoothly on his tracks.
O He insisted that all of the tracks he designed conformed to a standard size, which made it easier to connect all the tracks later.
He designed a type of track that could be curved around obstacles more easily.

answer: i looked it up

explanation: in 1955 in montgomery, alabama, a girl refused to give up her seat on a public bus. the girl was black, and the passenger looking to take her seat was white. this is a familiar tale, but it's not about rosa parks. the girl in the story is a 15-year-old high school student named claudette colvin, and this act of defiance occurred nine months before rosa parks did the same thing. colvin was arrested, and her case is what led to the u.s. supreme court's order for the desegregation of alabama's bus system. so, why don't we know colvin's name? "later i had a child born out of wedlock; i became pregnant when i was 16," colvin says. "and i didn't fit the image either, of, you know, someone they would want to show off.

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