During the late 1800s and early 1900s the modern United States has resembled because of the following:
the period was characterized with technological breakthroughs, creation of new businesses, new inventions (example: light bulb) , new methods, new ideas, businesses primarily concerned with the economy.
The correct answer is Canada.
While some went to the United Kingdom after the war, many took boats out of American cities and ended up in Halifax, now in Nova Scotia, before spreading out throughout what is today Canada.
Cooperation
A bit more info: Cold War tensions between the U.S. and the Soviet Union from 1967 to 1979. The era was a time of increased trade and cooperation with the Soviet Union and the signing of the Strategic Arms Limitation Talks (SALT) treaties
Dred Scott v Sandford
Brown v Board of Education was about black people with white people in the same school
Roe v Wade was about abortion
There is no Missouri v the United States
Schools were closed, and lack of sanitation are the effects.