What were the barriers to southern transportation

How can you use document e and f to argue that imperialism was more important than alliances and arms build up as the underlying cause of ww1? how could you counter this argument

Which of the following episodes led to widespread charges that president reagan was not in adequate control? a. the u. s. retreat from lebanon after the bombing deaths of 241 u. s. marines as they lay sleeping in their barracks near beirut b. the trading of arms for hostages and the illegal funding of a right-wing insurgency in the iran-contra affair c. the sale of millions of acres of public lands to private corporations by the department of interior d. the proposal to congress, year after year, of federal budgets with huge deficits that ultimately ended up tripling the national debt

What country aided north korea in the korean war?