C is the main one, but D is also very important (see The Voting Rights Act)
Answer:
Environmental
Explanation:
According to my research on movements during the 1960's, I can say that based on the information provided within the question the movement being defined is called the modern Environmental Movement. This movement took place during the 60's and 70's in the United States and was made in order to address a couple big environmental issues.
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The Eiffel Tower
it's really big and stuff
is an economic theory that explains how supply and demand are related to each other and how that relationship affects the price of goods and services. It's a fundamental economic principle that when supply exceeds demand for a good or service, prices fall. When demand exceeds supply, prices tend to rise.
The development of the steel industry and the railroads was deeply connected. The benefits were going in both directions. The steel industry was providing the material for building the railroads. s the railroads were expanding through the country, new areas were becoming connected, some of which had the ore needed to produce steel. Through the railroad, the ore was easily transported to the manufacturing facilities, so more steel was produced. As more steel was produced, there was even more material for building the railroads, but also a cheaper material, sot he railroads developed even more. In this manner, both sides managed to contribute to their development and prosper greatly.
