Mathematics, mostly.
They also did groundbreaking work in the following fields:
Astronomy
Philosophy
Geography
Sciences
Technology
---prejudice----
here is the definition of discrimination:
the unjust or prejudicial treatment of different categories of people or things, especially on the grounds of race, age, or sex.
It’s estimated that there’s over 25,000 miles
Answer:
The Mexico–United States barrier is a series of vertical barriers along the Mexico–United States border aimed at preventing illegal crossings from Mexico into the United States.
