I think it is war time executives.
Martin Luther Kind Jr or MLK Jr was a social activist as well as a Baptist minister. Martin Luther King Jr played an important role in the American Civil Rights movement. He was born on January 15, 1929. Unfortunately MLK was assassinated in April 4, 1968. He died at the age of 39.
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Blockades blocked the south from getting any supplies or weapons. They were surrounded and could not keep a fair fight. Lee knew this, thus leading to the surrender at Appomattox Courthouse.
The last one. During the crusades, different foods and such were found, different goods were unlocked to europe, and different mathematic and scientific ideas were brought back as well.