What is associated with: about 200000 black soldiers served in the civil war on this side?

What is associated with: about 2000 british soldiers were killed or wounded by jacksons troops in this last engagement… What is associated with: about 2000 years ago sextus propertius wrote that absence does this? What is associated with: about 20000 sicilians were killed in 1669 by this volcanos eruption accompanying earthquakes? What is associated with: about 20000 years ago hunters crossed whats now this strait to become north american indians? What is associated with: about 200000 strong this non active duty part of the us army has its headquarters in atlanta? What is associated with: about 220 miles at its widest point 10000 at its deepest its a wonder how the israelites cross… What is associated with: about 22000 square miles this country includes the regions of dalmatia istria? Based on the clue 'about 23 of the boundary between mexico the us is...', what is the answer?