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.
Domestic trends
There was an increased surge of nationalism in countries in Europe such as Spain under Franco, Italy under Mussolini and Germany under Hitler, which fueled dictatorial war ambitions. the financial conditions that hit the USA and European countries created conditions for hostility and conspiracies.
Foreign policy trends
increased imperialistic desires from European imperial powers and Japan increased tensions the weakness of the league of nation and the refusal of the usa to join it weakening it furtherthe formation of alliances also fueled tensionsthe policy of allied powers led by Neville chamberlain,called appeasement policy served to give the axis powers to prepare for war.
Letter C is the correct answer:D
Ans: Nationalism lead people to conflict. Archduke Franz Ferdinand was assassinated due nationalism by the Black Hand, a nationalist group that intended to liberate the Serbs from the Austro-Hungarian occupation. The death of Franz Ferdinand was one of the most important factos to cause the World War I.
