Answer:
have fallen by more than one-half.
Explanation:
Thick, noticeable smog in many of the cities and manufacturing centers of the United States helped bring the 1970 e Clean Air Act to spur passage at the height of the national environmental movement. The ensuing modifications were intended to enhance its effectiveness and address newly recognized problems of air pollution such as acid rain and stratospheric ozone layer damage. The Clean Air Act allows EPA to set national environmental air quality levels for certain specific and prevalent contaminants, based on the latest research, to protect public health and welfare nationally. Certain main regulations are intended to reduce the rise in emissions from increasing motor vehicle numbers and new manufacturing plants.
<span>Loyalty to old immigrants and discrimination against new immigrants.</span>
West Africa's smaller societies such as Benin and Hausa, grew in ways such as trade and farming, building off of previous achievements. Africa's larger kingdoms improved in the factors of education, with the introduction of new Muslim teachings, as seen in maliand shonghai kingdoms.
Answer:
A siege is a military's tactics that's carried out by surrounding the enemy's town with our own forces.
This tactic Brought Victory for American soldiers during our battle for Revolution against British army in Yorktown. In 1781, American colonists mobilized around 9,000 soldiers to surround Yorktown that occupied by the British soldiers.
This siege cut off every potential path that Yorktown soldiers usually used to receive their food supplies. In the end, the food supplies inside Yorktown started to gradually diminished and the leaders of Yorktown decided to surrender.
The 3rd Answer choice
The Tariff of 1828 was designed to protect northern industry by raising the Europeans taxes. The South however, relied on European countries such as Britain, to import goods and export crops.
