If you are talking about the first air pollution problem its is A, almost about 100 years ago.
1955
Answer:Presidios were established at San Diego, Santa Barbara, Monterey, and San Francisco. In 1821 Mexico gained independence from Spain and "Alta California" became a Mexican province rather than a Spanish colony. A new era began in California as ranch life flourished and American trappers began to enter the territory.
Explanation: Brainliest please
The holocaust created long term historical effects because all around the world today there are many organizations and even classes in schools that teach about it. Many other things came from it as well.
