For your first question about the impact of diminishing trade with Europe on South American nations following World War I, the most accurate response would be:
- more self-sufficient by manufacturing their own goods.
This reflects the trend where countries sought to develop their local industries due to less reliance on European goods.
For the second question regarding the statement that least accurately describes the problems South America faces regarding trade, the least accurate response would be:
- frequent trading exists amongst South American countries.
This statement contrasts with the reality that South American countries often engage in less trade among themselves compared to trade with outside nations, highlighting a significant issue in regional economic integration.