If you are talking about the first air pollution problem its is A, almost about 100 years ago.
1955
Answer:
n the 1860s, Otto von Bismarck, then Minister President of Prussia, provoked three short, decisive wars against Denmark, Austria, and France, aligning the smaller German states behind Prussia in its defeat of France. In 1871 he unified Germany into a nation-state, forming the German Empire
Explanation:
They were laws in the early history of the American south which legalized the segregation between blacks and whites.
Generally speaking, it would be earthquakes that do not threaten Central America, due to the fact that there are no major fault lines, although they are still technically possible.
