Answer:
Because the acid rain is a prime example of what could become of future Europe. Also, acid rain could also affect Europe Economically if they import resources from Germany or have trade with them. This could affect supply of products.
While today we see it as a moral issue, the South back in the Antebellum era saw it as an economical issue.
Almost 20% of the United States GDP is actually made up of Government Spending.
Contrary to popular belief the United States is NOT an example of a pure capitalist state.
The government intervenes quite often to provide schools, food banks, hospitals, universities, roads and even bails out banks and large corporations. The government even has anti-competition and anti-monopoly laws.
A pure capitalist state would mean even lower intervention by the Government and a free hand of Demand and Supply.
Mostly due to the ideas of Manifest Destiny. They started going westwards with the desire to span the United States from coast to coast, and then they started going worldwide. The idea behind it is that the United States were destined to help the world become free and democratic like they were so they started helping people worldwide in rebellions against colonialism or in similar affairs.
