July 4, 1776 is when the Declaration of Independence was adopted by the congress
It's kinda like an educated guess.
The nation of Cambodia was ruled by the oppressive military regime known as the Khmer Rouge back in the 1960s.
"<span> C. Nations often seek to protect their firms and their workers from competition" is the correct answer. Nations don't want cheaper goods coming in that will reduce jobs and GDP. </span>