Answer:
"Spain-" at the time of the Louisiana Purchase in 1803, Mexico wasn't an independent and soveriegncountry, it was still a part of the Spanish empire and thus controlled by Spain.
The system of escape routes and hiding places for runaway slaves was known as Underground Railroads.
In the US, slavery led to the creation of such escape routes and safe houses in order to help slaves escape and lead a normal life after that. They would either run to Canada or free states within America which abolished slavery. One of the most famous leaders was Harriet Tubman.
Vietnam was ruled by France during the 1800s. 1887 to be exact until Vietnam declared its independence in 1954.
