Which best explains how railroad companies were able to standardize their timetables in 1883?
o by combining into a single railway company
o by working together voluntarily
o by unionizing their labor forces
o by complying with federal legislation

answer: president kennedy is vowing to protect freedom in this paragraph.

b. martin luther king jr. wrote and spoke "i have a dream"

explanation:

i know this 100 percent is correct   b. is the best one. < 3

a plantation economy is an economy based on agricultural mass production, usually of a few commodity crops grown on large farms called plantations. plantation economies rely on the export of cash crops as a source of income.

i hope this : )

it made them more prductive and efficent but with the change of polcies less and les got into the navy