Answer:
The desegregation of the US Military.
Explanation:
The League of Nations was established after WWl between the United States and some European countries as an attempt to try to stay out of future wars. It was proposed by President Woodrow Wilson, but Congress denied involvement in the organization due to the fact that they believed we should not be meddling in Europe's affairs.
The answer is A. Drove production costs up. It drove production costs down, because they were able to take less time to make the products as well as less materials because 1) standardized parts were invented around the same time, and 2) they didn't have people preparing everything so materials weren't wasted.
D. sending a text messages on your cell phone
hope this helps
