The best example of Isolationism is: A. America strongly supporting Britain over France

B. America refusing to take a side or get involved in European conflicts

C. America applying a fair and open trade policy with Japan

D. America enforcing segregation laws in Southern States but not in Northern states

B

Explanation:

Im pretty sure thats the answer, isolationism means to be isolated, to stay away from anything and to be by yourself with no contact. B explains that america wants nothing to do with anything or to get involved which shows america is  trying to stay AWAY, isolated.

the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.

answer; obscene;