During the 1980s, the United was deeply involved in Latin
America because the growing problem of Communists insurgents in the region
particularly in El Salvador, Guatemala and Nicaragua. The Cold War was still on and the U.S. feared
that Communism would take root in these areas and might threaten if they
continue unabated.
The expense of making an additional shirt is know as the marginal cost. Hope this helps, good luck.
