Describe the bravely that was required by Martin Luther king to write this speech.

I'm assuming you are referring to the "I have a Dream" speech. This speech required the most bravery one could have because of how draining this would be. Black people were not only silenced in this time but ignored and by making himself this big public figure, he made himself a target of hate and crime because the people who disagree with him had the capacity to be extremely violent.

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.

b, public works good luck