a historical event is the act of describing where the event to place, what led to it and why (The circumstances surrounding the event... including the period in time). Sourcing Contextualizing Validating Consideration​

. political or economical policy that isolates a country from participating in international relationships. it has been suggested that the united states participates in isolationism because of its lack of involvement in particular wars or alliances.

answer: the risk-return relationship. generally, the higher the potential return of an investment, the higher the risk. there is no guarantee that you will actually get a higher return by accepting more risk. diversification enables you to reduce the risk of your portfolio without sacrificing potential returns.

explanation:

the answers are a b and d