What factor drew farm families to northern cities in the late 1800s?

The Industrial Era contributed to the immigration from farms to cities in the late 1800's. Factories were just starting to open and providing much needed jobs so people moved for work. The industrial revolution started in England and was a rise or change in the industry. Immigration shares to this because it triggered people to move places to get jobs which caused immigration. Cities swelled with waves of job seekers. It moved the world balance of power and increased the competition between industrialized nations and less developed ones.

churchill warned that the soviet union had cut eastern europe off from the west with an "iron curtain."

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the answer is b. hope this !