"D. It proved that black troops could fight bravely and well" is true about the 54th Massachusetts Regiment, which saw extensive action during the Civil War.
The UN uses global food systems to offer aid to poor countries.
The correct answer is <span>shortages of land
As a matter of fact, it was quite the opposite. The largest part of the land was completely uninhabited because of the harsh living conditions in those areas. If someone wanted land they could literally just went anywhere westwards or north and procured land easily if they wanted to live there. The other reasons did however cause Russian weakness.</span>