They took the place of men in many war industries
The Eagle, Globe, and Anchor—the most distinct of all Marine Corps marks—has a long and storied heritage as the emblem for the Marine Corps. It is the basis for the flag, the seal, the branch-of-service insignia, and many of the logos.
Two most important factors were the development of industry and industrialization, and the slave trade. People started accumulating large amounts of wealth due to these two and started investing them in businesses, both personal and by other people. This led to the development of capitalism not only in Europe, but other places too.
Answer: The correct answer is : b. served in the military and worked in war production.
Explanation: During the Second World War the government of the United States needed the help of the Navajo Indians. Given the need to create a secret military code that was not deciphered by the Japanese, the language of the Navajo Indians was used and code words were used since they did not have in their language many terms used in the war. 200 Navajo Indians were enlisted to act as key announcers.
By process of elimination the answer is D, I know the rest are true.