Which item fits appropriately in the blank

What was the “u-2 incident” and how did it affect u. s./soviet relations in 1960?

According to this map, why did the french do so well at the beginning of the seven years’ war?

The service industry in the united states grew in the late 1800s. what was one effect of that growth? the number of people with jobs in factories as unskilled workers decreased. the number of people with jobs in factories as unskilled workers increased. the middle class grew as people took jobs as clerks, lawyers, and teachers. the middle class shrank as people left jobs as clerks, lawyers, and teachers.