What was a major concern of scientists who left Nazi Germany for the United States before World War II?
They did not think Germany was paying attention to their work.
They did not think Germany wanted to develop nuclear weapons.
They feared Germany was trying to develop nuclear weapons.
They feared Germany would pass the US in industrial production
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They feared Germany was trying to develop nuclear weapons.

Explanation:

b.   jim crow laws were enacted in northern states.

the right answer is the third one: turnpikes went short distances to connect markets. turnpikes, also known as toll roads, were very important for trade and transportation (of people, goods and products) in the 19th century, coinciding with the expansion towards the west. they contributed significantly to the economic development of the united states.