Which of the following statements about president andrew johnson is true?
a. he was well educated, but he was a poor stump speaker.
b. he defended the planter aristocracy.
c. he was impeached and forced from office.
d. he was raised under conditions of extreme poverty.

they required less loading and unloading

explanation:

the shipping container improved shipping because it cut down on unloading time by three weeks, eliminated wasted space, and allowed ships to carry.

the right answer is the third one: turnpikes went short distances to connect markets. turnpikes, also known as toll roads, were very important for trade and transportation (of people, goods and products) in the 19th century, coinciding with the expansion towards the west. they contributed significantly to the economic development of the united states.