In the early 1900s, how did the development of mass transportation systems such as subways and trolleys impact urban areas?
a
b
They contributed to a geographic separation of socioeconomic classes.
They led to a reduction in the need for ethnic neighborhoods in cities.
They created a labor shortage as workers left factories for transportation jobs.
They reduced pollution in cities by ending problems with overcrowding.
С
d

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