Answer:
EPA was established on December 2, 1970 to consolidate in one agency a variety of federal research, monitoring, standard-setting and enforcement activities to ensure environmental protection.
Explanation:
google
What time period? maybe with a little more info I can help you
I am not going to answer in a paragraph of 125 words, but I will give you the answer to the first question; The United States didn't want another country to fall to communism. They officially got involved after the attack of the Gulf of Tonkin (U.S destroyers were stationed there and a radio came in that said they had been fired upon by North Vietnamese forces). (45 words BTW).
The Missouri compromise of 1850 helped balance the number of Free states and Slave states helping it avoid a war however it did not solve the issue of slavery keeping the nation divided.